import base64
import sys
import threading
import weakref
from collections import defaultdict
from logging import ERROR, WARNING, getLogger
from pathlib import Path

import cv2
import numpy as np
import six

from ..config import running_remotely
from ..model import InputModel, OutputModel, Framework

try:
    from google.protobuf.json_format import MessageToDict
except ImportError:
    MessageToDict = None

if six.PY2:
    # python2.x
    import __builtin__ as builtins
else:
    # python3.x
    import builtins


TrainsFrameworkAdapter = 'TrainsFrameworkAdapter'
_recursion_guard = {}


class _Empty(object):
    def __init__(self):
        self.trains_in_model = None


class PostImportHookPatching(object):
    _patched = False
    _post_import_hooks = defaultdict(list)

    @staticmethod
    def _init_hook():
        if PostImportHookPatching._patched:
            return
        PostImportHookPatching._patched = True

        if six.PY2:
            # python2.x
            builtins.__org_import__ = builtins.__import__
            builtins.__import__ = PostImportHookPatching._patched_import2
        else:
            # python3.x
            builtins.__org_import__ = builtins.__import__
            builtins.__import__ = PostImportHookPatching._patched_import3

    @staticmethod
    def _patched_import2(name, globals={}, locals={}, fromlist=[], level=-1):
        already_imported = name in sys.modules
        mod = builtins.__org_import__(
            name,
            globals=globals,
            locals=locals,
            fromlist=fromlist,
            level=level)

        if not already_imported and name in PostImportHookPatching._post_import_hooks:
            for hook in PostImportHookPatching._post_import_hooks[name]:
                hook()
        return mod

    @staticmethod
    def _patched_import3(name, globals=None, locals=None, fromlist=(), level=0):
        already_imported = name in sys.modules
        mod = builtins.__org_import__(
            name,
            globals=globals,
            locals=locals,
            fromlist=fromlist,
            level=level)

        if not already_imported and name in PostImportHookPatching._post_import_hooks:
            for hook in PostImportHookPatching._post_import_hooks[name]:
                hook()
        return mod

    @staticmethod
    def add_on_import(name, func):
        PostImportHookPatching._init_hook()
        if not name in PostImportHookPatching._post_import_hooks or \
                func not in PostImportHookPatching._post_import_hooks[name]:
            PostImportHookPatching._post_import_hooks[name].append(func)

    @staticmethod
    def remove_on_import(name, func):
        if name in PostImportHookPatching._post_import_hooks and func in PostImportHookPatching._post_import_hooks[name]:
            PostImportHookPatching._post_import_hooks[name].remove(func)


def _patched_call(original_fn, patched_fn):
    def _inner_patch(*args, **kwargs):
        ident = threading.get_ident()
        if ident in _recursion_guard:
            return original_fn(*args, **kwargs)
        _recursion_guard[ident] = 1
        try:
            ret = patched_fn(original_fn, *args, **kwargs)
        except Exception as ex:
            raise ex
        finally:
            try:
                _recursion_guard.pop(ident)
            except KeyError:
                pass
        return ret
    return _inner_patch


class WeightsFileHandler(object):
    _model_out_store_lookup = {}
    _model_in_store_lookup = {}
    _model_store_lookup_lock = threading.Lock()

    @staticmethod
    def restore_weights_file(model, filepath, framework, task):
        if task is None:
            return filepath

        if not filepath:
            getLogger(TrainsFrameworkAdapter).warning("Could retrieve model location, model not restored")
            return filepath

        try:
            WeightsFileHandler._model_store_lookup_lock.acquire()

            # check if object already has InputModel
            trains_in_model, ref_model = WeightsFileHandler._model_in_store_lookup.get(id(model), (None, None))
            if ref_model is not None and model != ref_model():
                # old id pop it - it was probably reused because the object is dead
                WeightsFileHandler._model_in_store_lookup.pop(id(model))
                trains_in_model, ref_model = None, None

            # check if object already has InputModel
            model_name_id = getattr(model, 'name', '')
            try:
                config_text = None
                config_dict = trains_in_model.config_dict if trains_in_model else None
            except Exception:
                config_dict = None
                try:
                    config_text = trains_in_model.config_text if trains_in_model else None
                except Exception:
                    config_text = None
            trains_in_model = InputModel.import_model(
                weights_url=filepath,
                config_dict=config_dict,
                config_text=config_text,
                name=task.name + ' ' + model_name_id,
                label_enumeration=task.get_labels_enumeration(),
                framework=framework,
                create_as_published=False,
            )
            try:
                ref_model = weakref.ref(model)
            except Exception:
                ref_model = None
            WeightsFileHandler._model_in_store_lookup[id(model)] = (trains_in_model, ref_model)
            # todo: support multiple models for the same task
            task.connect(trains_in_model)
            # if we are running remotely we should deserialize the object
            # because someone might have changed the config_dict
            if running_remotely():
                # reload the model
                model_config = trains_in_model.config_dict
                # verify that this is the same model so we are not deserializing a diff model
                if (config_dict and config_dict.get('config') and model_config and model_config.get('config') and
                    config_dict.get('config').get('name') == model_config.get('config').get('name')) or \
                        (not config_dict and not model_config):
                    filepath = trains_in_model.get_weights()
                    # update filepath to point to downloaded weights file
                    # actual model weights loading will be done outside the try/exception block
        except Exception as ex:
            getLogger(TrainsFrameworkAdapter).warning(str(ex))
        finally:
            WeightsFileHandler._model_store_lookup_lock.release()

        return filepath

    @staticmethod
    def create_output_model(model, saved_path, framework, task, singlefile=False, model_name=None):
        if task is None:
            return saved_path

        try:
            WeightsFileHandler._model_store_lookup_lock.acquire()

            # check if object already has InputModel
            trains_out_model, ref_model = WeightsFileHandler._model_out_store_lookup.get(id(model), (None, None))
            if ref_model is not None and model != ref_model():
                # old id pop it - it was probably reused because the object is dead
                WeightsFileHandler._model_out_store_lookup.pop(id(model))
                trains_out_model, ref_model = None, None

            # check if object already has InputModel
            if trains_out_model is None:
                trains_out_model = OutputModel(
                    task=task,
                    # config_dict=config,
                    name=(task.name + ' - ' + model_name) if model_name else None,
                    label_enumeration=task.get_labels_enumeration(),
                    framework=framework,)
                try:
                    ref_model = weakref.ref(model)
                except Exception:
                    ref_model = None
                WeightsFileHandler._model_out_store_lookup[id(model)] = (trains_out_model, ref_model)

            if not saved_path:
                getLogger(TrainsFrameworkAdapter).warning("Could retrieve model location, stored as unknown ")
                return saved_path

            # check if we have output storage, and generate list of files to upload
            if trains_out_model.upload_storage_uri:
                if Path(saved_path).is_dir():
                    files = [str(f) for f in Path(saved_path).rglob('*') if f.is_file()]
                elif singlefile:
                    files = [str(Path(saved_path).absolute())]
                else:
                    files = [str(f) for f in Path(saved_path).parent.glob(str(Path(saved_path).name)+'.*')]
            else:
                files = None

            # upload files if we found them, or just register the original path
            if files:
                if len(files) > 1:
                    try:
                        target_filename = Path(saved_path).stem
                    except Exception:
                        target_filename = None
                    trains_out_model.update_weights_package(weights_filenames=files, auto_delete_file=False,
                                                          target_filename=target_filename)
                else:
                    trains_out_model.update_weights(weights_filename=files[0], auto_delete_file=False)
            else:
                trains_out_model.update_weights(weights_filename=None, register_uri=saved_path)
        except Exception as ex:
            getLogger(TrainsFrameworkAdapter).warning(str(ex))
        finally:
            WeightsFileHandler._model_store_lookup_lock.release()

        return saved_path


class EventTrainsWriter(object):
    """
    TF SummaryWriter implementation that converts the tensorboard's summary into
    Trains events and reports the events (metrics) for an Trains task (logger).
    """
    _add_lock = threading.Lock()
    _series_name_lookup = {}

    @property
    def variants(self):
        return self._variants

    def prepare_report(self):
        return self.variants.copy()

    @staticmethod
    def tag_splitter(tag, num_split_parts, split_char='/', join_char='_', default_title='variant'):
        """
        Split a tf.summary tag line to variant and metric.
        Variant is the first part of the splitted tag, metric is the second.
        :param str tag:
        :param int num_split_parts:
        :param str split_char: a character to split the tag on
        :param str join_char:  a character to join the the splits
        :param str default_title: variant to use in case no variant can be inferred automatically
        :return: (str, str) variant and metric
        """
        splitted_tag = tag.split(split_char)
        series = join_char.join(splitted_tag[-num_split_parts:])
        title = join_char.join(splitted_tag[:-num_split_parts]) or default_title
        return title, series

    def __init__(self, logger, report_freq=100, image_report_freq=None, histogram_update_freq_multiplier=10,
                 histogram_granularity=50, max_keep_images=None):
        """
        Create a compatible Trains backend to the TensorFlow SummaryToEventTransformer
        Everything will be serialized directly to the Trains backend, instead of to the standard TF FileWriter

        :param logger: The task.logger to use for sending the metrics (def: task.get_logger())
        :param report_freq: How often to update the statistics values
        :param image_report_freq: How often to upload images (step % image_update_freq == 0)
        :param histogram_update_freq_multiplier: How often to upload histogram
               (step//update_freq) % histogram_update_freq_multiplier == 0
        :param histogram_granularity: How many histograms (lines) to display in the 3d histogram plot
        :param max_keep_images: Maximum number of images to save before starting to reuse files (per title/metric pair)
        """
        # We are the events_writer, so that's what we'll pass
        self.max_keep_images = max_keep_images
        self.report_freq = report_freq
        self.image_report_freq = image_report_freq if image_report_freq else report_freq
        self.histogram_granularity = histogram_granularity
        self.histogram_update_freq_multiplier = histogram_update_freq_multiplier
        self._logger = logger
        self._visualization_mode = 'BGR'
        self._variants = defaultdict(lambda: ())
        self._scalar_report_cache = {}
        self._hist_report_cache = {}
        self._hist_x_granularity = 50
        self._max_step = 0

    def _decode_image(self, img_str, width, height, color_channels):
        try:
            image_string = np.asarray(bytearray(base64.b64decode(img_str)), dtype=np.uint8)
            image = cv2.imdecode(image_string, cv2.IMREAD_COLOR)
            val = image.reshape(height, width, -1).astype(np.uint8)
            if val.ndim == 3 and val.shape[2] == 3:
                if self._visualization_mode == 'BGR':
                    val = val[:, :, [2, 1, 0]]
                else:
                    val = val
            elif (val.ndim == 2) or (val.ndim == 3 and val.shape[2] == 1):
                val = np.tile(np.atleast_3d(val), (1, 1, 3))
            elif val.ndim == 3 and val.shape[2] == 4:
                if self._visualization_mode == 'BGR':
                    val = val[:, :, [2, 1, 0]]
                else:
                    val = val[:, :, [0, 1, 2]]
        except Exception:
            self._logger.warning('Failed decoding debug image [%d, %d, %d]' % (width, height, color_channels))
            val = None
        return val

    def _add_image_numpy(self, tag, step, img_data_np, max_keep_images=None):
        # only report images every specific interval
        if step % self.image_report_freq != 0:
            return None

        if img_data_np is None:
            return

        title, series = self.tag_splitter(tag, num_split_parts=3, default_title='Images')
        if img_data_np.dtype != np.uint8:
            # assume scale 0-1
            img_data_np = (img_data_np*255).astype(np.uint8)

        # if 3d, pack into one big image
        if img_data_np.ndim == 4:
            dims = img_data_np.shape
            stack_dim = int(np.sqrt(dims[0]))
            res = img_data_np.reshape(stack_dim, stack_dim, *dims[1:]).transpose((0, 2, 1, 3, 4))
            tile_size = res.shape[0] * res.shape[1]
            img_data_np = res.reshape(tile_size, tile_size, -1)

        self._logger.report_image_and_upload(
            title=title,
            series=series,
            iteration=step,
            matrix=img_data_np,
            max_image_history=self.max_keep_images if max_keep_images is None else max_keep_images,
        )

    def _add_image(self, tag, step, img_data):
        # only report images every specific interval
        if step % self.image_report_freq != 0:
            return None

        width = img_data['width']
        height = img_data['height']
        colorspace = img_data['colorspace']
        img_str = img_data['encodedImageString']
        matrix = self._decode_image(img_str, width=width, height=height, color_channels=colorspace)
        if matrix is None:
            return

        return self._add_image_numpy(tag=tag, step=step, img_data_np=matrix)

    def _add_scalar(self, tag, step, scalar_data):
        title, series = self.tag_splitter(tag, num_split_parts=1, default_title='Scalars')

        # update scalar cache
        num, value = self._scalar_report_cache.get((title, series), (0, 0))
        self._scalar_report_cache[(title, series)] = (num + 1, value + scalar_data)

        # only report images every specific interval
        if step % self.report_freq != 0:
            return None

        # calculate mean and zero cache
        num, value = self._scalar_report_cache.get((title, series), (0, 0))
        scalar_data = value / num
        self._scalar_report_cache[(title, series)] = (0, 0)

        self._logger.report_scalar(
            title=title,
            series=series,
            iteration=step,
            value=scalar_data,
        )

    def _add_histogram(self, tag, step, histo_data):
        def _sample_histograms(_hist_iters, _histogram_granularity):
            # resample history based on distribution of samples across time (steps)
            ratio = ((_hist_iters[-1] - _hist_iters[_histogram_granularity]) /
                     (_hist_iters[_histogram_granularity - 1] - _hist_iters[0])) if \
                _hist_iters.size > _histogram_granularity else 0.
            cur_idx_below = np.arange(0, min(_hist_iters.size, _histogram_granularity - 1))
            np.random.shuffle(cur_idx_below)
            cur_idx_below = cur_idx_below[:int(_histogram_granularity * (1.0 - ratio / (1 + ratio)) + 0.5)]
            if ratio > 0.0:
                cur_idx_above = np.arange(_histogram_granularity - 1, _hist_iters.size)
                np.random.shuffle(cur_idx_above)
                cur_idx_above = cur_idx_above[:int(_histogram_granularity * ratio / (1 + ratio))]
            else:
                cur_idx_above = np.array([])
            _cur_idx = np.unique(np.sort(np.concatenate((cur_idx_below, cur_idx_above)).astype(np.int)))
            return _cur_idx

        # only collect histogram every specific interval
        if step % self.report_freq != 0 or step < self.report_freq - 1:
            return None

        # generate forward matrix of the histograms
        # Y-axis (rows) is iteration (from 0 to current Step)
        # X-axis averaged bins (conformed sample 'bucketLimit')
        # Z-axis actual value (interpolated 'bucket')
        title, series = self.tag_splitter(tag, num_split_parts=1, default_title='Histograms')

        # get histograms from cache
        hist_list, hist_iters, minmax = self._hist_report_cache.get((title, series), ([], np.array([]), None))

        # resample data so we are always constrained in number of histogram we keep
        if hist_iters.size >= self.histogram_granularity**2:
            idx = _sample_histograms(hist_iters, self.histogram_granularity)
            hist_iters = hist_iters[idx]
            hist_list = [hist_list[i] for i in idx]

        # check if current sample is not already here (actually happens some times)
        if step in hist_iters:
            return None

        # add current sample, if not already here
        hist_iters = np.append(hist_iters, step)
        hist = np.array(list(zip(histo_data['bucketLimit'], histo_data['bucket'])), dtype=np.float32)
        hist = hist[~np.isinf(hist[:, 0]), :]
        hist_list.append(hist)
        # keep track of min/max values of histograms (for later re-binning)
        if minmax is None:
            minmax = hist[:, 0].min(), hist[:, 0].max()
        else:
            minmax = min(minmax[0], hist[:, 0].min()), max(minmax[1], hist[:, 0].max())

        # update the cache
        self._hist_report_cache[(title, series)] = hist_list, hist_iters, minmax

        # only report histogram every specific interval, but do report the first few, so you know there are histograms
        if hist_iters.size < 1 or (hist_iters.size >= self.histogram_update_freq_multiplier and
                                   hist_iters.size % self.histogram_update_freq_multiplier != 0):
            return None

        # resample histograms on a unified bin axis
        _minmax = minmax[0] - 1, minmax[1] + 1
        prev_xedge = np.arange(start=_minmax[0],
                               step=(_minmax[1]-_minmax[0])/(self._hist_x_granularity-2), stop=_minmax[1])
        # uniformly select histograms and the last one
        cur_idx = _sample_histograms(hist_iters, self.histogram_granularity)
        report_hist = np.zeros(shape=(len(cur_idx), prev_xedge.size), dtype=np.float32)
        for i, n in enumerate(cur_idx):
            h = hist_list[n]
            report_hist[i, :] = np.interp(prev_xedge, h[:, 0], h[:, 1], right=0, left=0)
        yedges = hist_iters[cur_idx]
        xedges = prev_xedge

        # if only a single line make, add another zero line, for the scatter plot to draw
        if report_hist.shape[0] < 2:
            report_hist = np.vstack((np.zeros_like(report_hist), report_hist))

        # create 3d line (scatter) of histograms
        skipx = max(1, int(xedges.size / 10))
        skipy = max(1, int(yedges.size / 10))
        xlabels = ['%.2f' % v if i % skipx == 0 else '' for i, v in enumerate(xedges[:-1])]
        ylabels = [str(int(v)) if i % skipy == 0 else '' for i, v in enumerate(yedges)]
        self._logger.report_surface(
            title=title,
            series=series,
            iteration=0,
            xtitle=' ',
            ytitle='iteration',
            xlabels=xlabels,
            ylabels=ylabels,
            matrix=report_hist,
            camera=(-0.1, +1.3, 1.4))

    def _add_plot(self, tag, step, values, vdict):
        try:
            plot_values = np.frombuffer(base64.b64decode(values['tensorContent'].encode('utf-8')),
                                        dtype=np.float32)
            plot_values = plot_values.reshape((int(values['tensorShape']['dim'][0]['size']),
                                               int(values['tensorShape']['dim'][1]['size'])))
            if 'metadata' in vdict:
                if tag not in self._series_name_lookup:
                    self._series_name_lookup[tag] = [(tag, vdict['metadata']['displayName'],
                                                      vdict['metadata']['pluginData']['pluginName'])]
                else:
                    # this should not happen, maybe it's another run, let increase the value
                    self._series_name_lookup[tag] += [(tag+'_%d' % len(self._series_name_lookup[tag])+1,
                                                       vdict['metadata']['displayName'],
                                                       vdict['metadata']['pluginData']['pluginName'])]

            tag, series, plugin_name = self._series_name_lookup.get(tag, [(tag, tag, '')])[-1]

            if 'pr_curve' in plugin_name:
                # our thresholds are evenly distributed, in that
                #   width = 1.0 / (num_thresholds - 1)
                #   thresholds = [0.0, 1*width, 2*width, 3*width, ..., 1.0]
                num_thresholds = plot_values.shape[1]
                width = 1.0 / (num_thresholds - 1)
                thresholds = np.arange(0.0, 1.0, width, dtype=plot_values.dtype)
                data_points = ['TP     ', 'FP     ', 'TN     ', 'FN     ', 'Precision ', ' Recall']
                series = [{'name': series, 'data': np.vstack((thresholds, plot_values[-2])).T,
                           'labels': [''.join(data_points) + '<br> ' +
                                      '  '.join(['%-3.2f' % v for v in plot_values[:, j]]) for j in
                                      range(plot_values.shape[1])]}]
                reverse_xaxis = True
            else:
                reverse_xaxis = False
                series = [{'name': series, 'data': plot_values}]
            self._logger.report_line_plot(title=tag, series=series, xaxis='', yaxis='',
                                          iteration=step, reverse_xaxis=reverse_xaxis)
        except Exception:
            pass

    def add_event(self, event, step=None, walltime=None, **kwargs):
        supported_metrics = {
            'simpleValue', 'image', 'histo', 'tensor'
        }

        def get_data(value_dict, metric_search_order):
            data = None
            metric_type = 'Unsupported'
            for variant in metric_search_order:
                data = value_dict.get(variant)
                if data is not None:
                    metric_type = variant
                    break
            return metric_type, data

        # Support multiple threads accessing this instance (i.e. let TF/Keras do what they need)
        with self._add_lock:
            # TODO: add report frequency threshold (i.e. if we are sending too much data, increase the report_freq)
            # we should measure reports per second and throttle back the reporting details accordingly
            msg_dict = MessageToDict(event)
            summary = msg_dict.get('summary')
            if summary is None:
                msg_dict.pop('step', None)
                msg_dict.pop('wallTime', None)
                keys_list = [key for key in msg_dict.keys() if len(key) > 0]
                keys_list = ', '.join(keys_list)
                self._logger.debug('event summary not found, message type unsupported: %s' % keys_list)
                return
            value_dicts = summary.get('value')
            walltime = walltime or msg_dict.get('step')
            step = step or msg_dict.get('step')
            if step is None:
                # when we start a new epoch there is no step in the msg_dict,
                # we have to extract it manually
                if hasattr(event, 'step'):
                    step = int(event.step)
                else:
                    step = 0
                    self._logger.debug('Recieved event without step, assuming step = {}'.format(step), WARNING)
            else:
                step = int(step)
            self._max_step = max(self._max_step, step)
            if value_dicts is None:
                self._logger.debug("Summary with arrived without 'value'", ERROR)
                return

            for vdict in value_dicts:
                tag = vdict.pop('tag', None)
                if tag is None:
                    # we should not get here
                    self._logger.debug('No tag for \'value\' existing keys %s' % ', '.join(vdict.keys()))
                    continue
                metric, values = get_data(vdict, supported_metrics)
                if metric == 'simpleValue':
                    self._add_scalar(tag=tag, step=step, scalar_data=values)
                elif metric == 'histo':
                    self._add_histogram(tag=tag, step=step, histo_data=values)
                elif metric == 'image':
                    self._add_image(tag=tag, step=step, img_data=values)
                elif metric == 'tensor' and values.get('dtype') == 'DT_STRING':
                    # text, just print to console
                    text = base64.b64decode('\n'.join(values['stringVal'])).decode('utf-8')
                    self._logger.report_text(msg='SUMMARY LOG: {} {}'.format(tag, text), print_console=False)
                elif metric == 'tensor' and values.get('dtype') == 'DT_FLOAT':
                    self._add_plot(tag, step, values, vdict)
                else:
                    self._logger.debug('Event unsupported. tag = %s, vdict keys [%s]' % (tag, ', '.join(vdict.keys)))
                    continue

    def get_logdir(self):
        """ Returns a temporary directory name for compatibility with FileWriter. This directory is not actually used.
        :return: '.'
        """
        return '.'

    def flush(self):
        """Flushes the event file to disk.

        Call this method to make sure that all pending events have been written to
        disk.
        """
        self._logger.flush()

    def close(self):
        """Flushes the event file to disk and close the file.

        Call this method when you do not need the summary writer anymore.
        """
        self._logger.flush()

    def reopen(self):
        """Reopens the EventFileWriter.

        Can be called after `close()` to add more events in the same directory.
        The events will go into a new events file.

        Does nothing if the EventFileWriter was not closed.
        """
        pass


class ProxyEventsWriter(object):
    def __init__(self, events):
        self._events = events

    def _get_sentinel_event(self):
        ret = None
        for ev in self._events:
            if hasattr(ev, '_get_sentinel_event'):
                ret = ev._get_sentinel_event()
        return ret

    def get_logdir(self):
        ret = None
        for ev in self._events:
            if hasattr(ev, 'get_logdir'):
                ret = ev.get_logdir()
        return ret

    def reopen(self):
        ret = None
        for ev in self._events:
            if hasattr(ev, 'reopen'):
                ret = ev.reopen()
        return ret

    def add_event(self, *args, **kwargs):
        ret = None
        for ev in self._events:
            if hasattr(ev, 'add_event'):
                ret = ev.add_event(*args, **kwargs)
        return ret

    def flush(self):
        ret = None
        for ev in self._events:
            if hasattr(ev, 'flush'):
                ret = ev.flush()
        return ret

    def close(self):
        ret = None
        for ev in self._events:
            if hasattr(ev, 'close'):
                ret = ev.close()
        return ret


class PatchSummaryToEventTransformer(object):
    __main_task = None
    __original_getattribute = None
    __original_getattributeX = None
    _original_add_event = None
    _original_add_eventT = None
    _original_add_eventX = None
    defaults_dict = dict(
        report_freq=1, image_report_freq=1, histogram_update_freq_multiplier=5,
        histogram_granularity=50)

    @staticmethod
    def trains_object(self):
        if isinstance(self.event_writer, ProxyEventsWriter):
            trains_writer = [e for e in self.event_writer._events if isinstance(e, EventTrainsWriter)]
            return trains_writer[0] if trains_writer else None
        elif isinstance(self.event_writer, EventTrainsWriter):
            return self.event_writer
        if not self.__dict__.get('_trains_defaults'):
            self.__dict__['_trains_defaults'] = {}
        return self.__dict__['_trains_defaults']

    @staticmethod
    def update_current_task(task, **kwargs):
        PatchSummaryToEventTransformer.defaults_dict.update(kwargs)
        PatchSummaryToEventTransformer.__main_task = task
        # make sure we patched the SummaryToEventTransformer
        PatchSummaryToEventTransformer._patch_summary_to_event_transformer()
        PostImportHookPatching.add_on_import('tensorflow',
                                             PatchSummaryToEventTransformer._patch_summary_to_event_transformer)
        PostImportHookPatching.add_on_import('torch',
                                             PatchSummaryToEventTransformer._patch_summary_to_event_transformer)
        PostImportHookPatching.add_on_import('tensorboardX',
                                             PatchSummaryToEventTransformer._patch_summary_to_event_transformer)

    @staticmethod
    def _patch_summary_to_event_transformer():
        if 'tensorflow' in sys.modules:
            try:
                from tensorflow.python.summary.writer.writer import SummaryToEventTransformer
                # only patch once
                if PatchSummaryToEventTransformer.__original_getattribute is None:
                    PatchSummaryToEventTransformer.__original_getattribute = SummaryToEventTransformer.__getattribute__
                    SummaryToEventTransformer.__getattribute__ = PatchSummaryToEventTransformer._patched_getattribute
                    setattr(SummaryToEventTransformer, 'trains',
                            property(PatchSummaryToEventTransformer.trains_object))
            except Exception as ex:
                getLogger(TrainsFrameworkAdapter).warning(str(ex))

        if 'torch' in sys.modules:
            try:
                # only patch once
                if PatchSummaryToEventTransformer._original_add_eventT is None:
                    from torch.utils.tensorboard.writer import FileWriter as FileWriterT
                    PatchSummaryToEventTransformer._original_add_eventT = FileWriterT.add_event
                    FileWriterT.add_event = PatchSummaryToEventTransformer._patched_add_eventT
                    setattr(FileWriterT, 'trains', None)
            except ImportError:
                # this is a new version of TensorflowX
                pass
            except Exception as ex:
                getLogger(TrainsFrameworkAdapter).warning(str(ex))

        if 'tensorboardX' in sys.modules:
            try:
                # only patch once
                if PatchSummaryToEventTransformer.__original_getattributeX is None:
                    from tensorboardX.writer import SummaryToEventTransformer as SummaryToEventTransformerX
                    PatchSummaryToEventTransformer.__original_getattributeX = SummaryToEventTransformerX.__getattribute__
                    SummaryToEventTransformerX.__getattribute__ = PatchSummaryToEventTransformer._patched_getattributeX
                    setattr(SummaryToEventTransformerX, 'trains',
                            property(PatchSummaryToEventTransformer.trains_object))
            except ImportError:
                # this is a new version of TensorflowX
                pass
            except Exception as ex:
                getLogger(TrainsFrameworkAdapter).warning(str(ex))

            if PatchSummaryToEventTransformer.__original_getattributeX is None:
                try:
                    # only patch once
                    if PatchSummaryToEventTransformer._original_add_eventX is None:
                        from tensorboardX.writer import FileWriter as FileWriterX
                        PatchSummaryToEventTransformer._original_add_eventX = FileWriterX.add_event
                        FileWriterX.add_event = PatchSummaryToEventTransformer._patched_add_eventX
                        setattr(FileWriterX, 'trains', None)
                except ImportError:
                    # this is a new version of TensorflowX
                    pass
                except Exception as ex:
                    getLogger(TrainsFrameworkAdapter).warning(str(ex))

    @staticmethod
    def _patched_add_eventT(self, *args, **kwargs):
        if not hasattr(self, 'trains') or not PatchSummaryToEventTransformer.__main_task:
            return PatchSummaryToEventTransformer._original_add_eventT(self, *args, **kwargs)
        if not self.trains:
            self.trains = EventTrainsWriter(PatchSummaryToEventTransformer.__main_task.get_logger(),
                                        **PatchSummaryToEventTransformer.defaults_dict)
        try:
            self.trains.add_event(*args, **kwargs)
        except Exception:
            pass
        return PatchSummaryToEventTransformer._original_add_eventT(self, *args, **kwargs)

    @staticmethod
    def _patched_add_eventX(self, *args, **kwargs):
        if not hasattr(self, 'trains') or not PatchSummaryToEventTransformer.__main_task:
            return PatchSummaryToEventTransformer._original_add_eventX(self, *args, **kwargs)
        if not self.trains:
            self.trains = EventTrainsWriter(PatchSummaryToEventTransformer.__main_task.get_logger(),
                                        **PatchSummaryToEventTransformer.defaults_dict)
        try:
            self.trains.add_event(*args, **kwargs)
        except Exception:
            pass
        return PatchSummaryToEventTransformer._original_add_eventX(self, *args, **kwargs)

    @staticmethod
    def _patched_getattribute(self, attr):
        get_base = PatchSummaryToEventTransformer.__original_getattribute
        return PatchSummaryToEventTransformer._patched_getattribute_(self, attr, get_base)

    @staticmethod
    def _patched_getattributeX(self, attr):
        get_base = PatchSummaryToEventTransformer.__original_getattributeX
        return PatchSummaryToEventTransformer._patched_getattribute_(self, attr, get_base)

    @staticmethod
    def _patched_getattribute_(self, attr, get_base):
        # no main task, zero chance we have an Trains event logger
        if PatchSummaryToEventTransformer.__main_task is None:
            return get_base(self, attr)

        # check if we already have an Trains event logger
        __dict__ = get_base(self, '__dict__')
        if 'event_writer' not in __dict__ or \
                isinstance(__dict__['event_writer'], (ProxyEventsWriter, EventTrainsWriter)):
            return get_base(self, attr)

        # patch the events writer field, and add a double Event Logger (Trains and original)
        base_eventwriter = __dict__['event_writer']
        defaults_dict = __dict__.get('_trains_defaults') or PatchSummaryToEventTransformer.defaults_dict
        trains_event = EventTrainsWriter(PatchSummaryToEventTransformer.__main_task.get_logger(), **defaults_dict)

        # order is important, the return value of ProxyEventsWriter is the last object in the list
        __dict__['event_writer'] = ProxyEventsWriter([trains_event, base_eventwriter])
        return get_base(self, attr)


class _ModelAdapter(object):
    """ Model adapter which extends the save and save_weights methods of a Keras Model instance """
    _model = None  # type: Any
    _output_model = None  # type: OutputModel

    def __init__(self, model, output_model):
        super(_ModelAdapter, self).__init__()
        super(_ModelAdapter, self).__setattr__('_model', model)
        super(_ModelAdapter, self).__setattr__('_output_model', output_model)
        super(_ModelAdapter, self).__setattr__('_logger', getLogger('TrainsModelAdapter'))

    def __getattr__(self, attr):
        return getattr(self._model, attr)

    def __setattr__(self, key, value):
        return setattr(self._model, key, value)

    def save(self, filepath, overwrite=True, include_optimizer=True):
        self._model.save(filepath=filepath, overwrite=overwrite, include_optimizer=include_optimizer)
        # TODO: auto generate new objects of filename changes
        try:
            self._output_model.update_weights(weights_filename=filepath, auto_delete_file=True)
        except Exception as ex:
            self._logger.error(str(ex))

    def save_weights(self, filepath, overwrite=True):
        self._model.save_weights(filepath=filepath, overwrite=overwrite)
        # TODO: auto generate new objects of filename changes
        try:
            self._output_model.update_weights(weights_filename=filepath, auto_delete_file=True)
        except Exception as ex:
            self._logger.error(str(ex))


class PatchModelCheckPointCallback(object):
    __main_task = None
    __original_getattribute = None
    defaults_dict = dict(
        config_text=None,
        config_dict=None,
        label_enumeration=None,
        name=None,
        comment=None)

    @staticmethod
    def trains_object(self):
        if isinstance(self.model, _ModelAdapter):
            return self.model._output_model
        if not self.__dict__.get('_trains_defaults'):
            self.__dict__['_trains_defaults'] = {}
        return self.__dict__['_trains_defaults']

    @staticmethod
    def update_current_task(task, **kwargs):
        PatchModelCheckPointCallback.defaults_dict.update(kwargs)
        PatchModelCheckPointCallback.__main_task = task
        # make sure we patched the SummaryToEventTransformer
        PatchModelCheckPointCallback._patch_model_checkpoint()
        PostImportHookPatching.add_on_import('keras', PatchModelCheckPointCallback._patch_model_checkpoint)
        PostImportHookPatching.add_on_import('tensorflow', PatchModelCheckPointCallback._patch_model_checkpoint)

    @staticmethod
    def _patch_model_checkpoint():
        is_keras = 'keras' in sys.modules
        is_tf_keras = 'tensorflow' in sys.modules
        callbacks = None
        if is_keras:
            try:
                import keras.callbacks as callbacks
            except ImportError:
                is_keras = False
        if not is_keras and is_tf_keras:
            try:
                # hack: make sure tensorflow.__init__ is called
                import tensorflow
                import tensorflow.python.keras.callbacks as callbacks
            except ImportError:
                is_tf_keras = False
                callbacks = None
        # we have nothing, quit
        if not is_keras and not is_tf_keras:
            return

        try:
            # only patch once
            if PatchModelCheckPointCallback.__original_getattribute is None and callbacks is not None:
                PatchModelCheckPointCallback.__original_getattribute = callbacks.ModelCheckpoint.__getattribute__
                callbacks.ModelCheckpoint.__getattribute__ = PatchModelCheckPointCallback._patched_getattribute
                setattr(callbacks.ModelCheckpoint, 'trains',
                        property(PatchModelCheckPointCallback.trains_object))

        except Exception as ex:
            getLogger(TrainsFrameworkAdapter).warning(str(ex))

    @staticmethod
    def _patched_getattribute(self, attr):
        get_base = PatchModelCheckPointCallback.__original_getattribute

        # no main task, zero chance we have an Trains event logger
        if PatchModelCheckPointCallback.__main_task is None:
            return get_base(self, attr)

        # check if we already have an Trains event logger
        __dict__ = get_base(self, '__dict__')
        if 'model' not in __dict__ or \
                isinstance(__dict__['model'], _ModelAdapter):
            return get_base(self, attr)

        # patch the events writer field, and add a double Event Logger (Trains and original)
        base_model = __dict__['model']
        defaults_dict = __dict__.get('_trains_defaults') or PatchModelCheckPointCallback.defaults_dict
        output_model = OutputModel(
            PatchModelCheckPointCallback.__main_task,
            config_text=defaults_dict.get('config_text'),
            config_dict=defaults_dict.get('config_dict'),
            name=defaults_dict.get('name'),
            comment=defaults_dict.get('comment'),
            label_enumeration=defaults_dict.get('label_enumeration') or
                              PatchModelCheckPointCallback.__main_task.get_labels_enumeration(),
            framework=Framework.keras,
        )
        output_model.set_upload_destination(
            PatchModelCheckPointCallback.__main_task.get_output_destination(raise_on_error=False))
        trains_model = _ModelAdapter(base_model, output_model)

        # order is important, the return value of ProxyEventsWriter is the last object in the list
        __dict__['model'] = trains_model
        return get_base(self, attr)


class PatchTensorFlowEager(object):
    __main_task = None
    __original_fn_scalar = None
    __original_fn_hist = None
    __original_fn_image = None
    __trains_event_writer = None
    defaults_dict = dict(
        report_freq=1, image_report_freq=1, histogram_update_freq_multiplier=5,
        histogram_granularity=50)

    @staticmethod
    def update_current_task(task, **kwargs):
        PatchTensorFlowEager.defaults_dict.update(kwargs)
        PatchTensorFlowEager.__main_task = task
        # make sure we patched the SummaryToEventTransformer
        PatchTensorFlowEager._patch_model_checkpoint()
        PostImportHookPatching.add_on_import('tensorflow', PatchTensorFlowEager._patch_model_checkpoint)

    @staticmethod
    def _patch_model_checkpoint():
        if PatchTensorFlowEager.__original_fn_scalar is not None:
            return
        if 'tensorflow' in sys.modules:
            try:
                # hack: make sure tensorflow.__init__ is called
                import tensorflow
                from tensorflow.python.ops import gen_summary_ops
                PatchTensorFlowEager.__original_fn_scalar = gen_summary_ops.write_scalar_summary
                gen_summary_ops.write_scalar_summary = PatchTensorFlowEager._write_scalar_summary
                PatchTensorFlowEager.__original_fn_image = gen_summary_ops.write_image_summary
                gen_summary_ops.write_image_summary = PatchTensorFlowEager._write_image_summary
                PatchTensorFlowEager.__original_fn_hist = gen_summary_ops.write_histogram_summary
                gen_summary_ops.write_histogram_summary = PatchTensorFlowEager._write_hist_summary
            except ImportError:
                pass
            except Exception as ex:
                getLogger(TrainsFrameworkAdapter).warning(str(ex))

    @staticmethod
    def _get_event_writer():
        if not PatchTensorFlowEager.__main_task:
            return None
        if PatchTensorFlowEager.__trains_event_writer is None:
            PatchTensorFlowEager.__trains_event_writer = EventTrainsWriter(
                logger=PatchTensorFlowEager.__main_task.get_logger(), **PatchTensorFlowEager.defaults_dict)
        return PatchTensorFlowEager.__trains_event_writer

    @staticmethod
    def trains_object(self):
        return PatchTensorFlowEager.__trains_event_writer

    @staticmethod
    def _write_scalar_summary(writer, step, tag, value, name=None, **kwargs):
        event_writer = PatchTensorFlowEager._get_event_writer()
        if event_writer:
            try:
                event_writer._add_scalar(tag=str(tag), step=int(step.numpy()), scalar_data=value.numpy())
            except Exception as ex:
                getLogger(TrainsFrameworkAdapter).warning(str(ex))
        return PatchTensorFlowEager.__original_fn_scalar(writer, step, tag, value, name, **kwargs)

    @staticmethod
    def _write_hist_summary(writer, step, tag, values, name, **kwargs):
        event_writer = PatchTensorFlowEager._get_event_writer()
        if event_writer:
            try:
                event_writer._add_histogram(tag=str(tag), step=int(step.numpy()), histo_data=values.numpy())
            except Exception as ex:
                getLogger(TrainsFrameworkAdapter).warning(str(ex))
        return PatchTensorFlowEager.__original_fn_hist(writer, step, tag, values, name, **kwargs)

    @staticmethod
    def _write_image_summary(writer, step, tag, tensor, bad_color, max_images, name, **kwargs):
        event_writer = PatchTensorFlowEager._get_event_writer()
        if event_writer:
            try:
                event_writer._add_image_numpy(tag=str(tag), step=int(step.numpy()), img_data_np=tensor.numpy(),
                                              max_keep_images=max_images)
            except Exception as ex:
                getLogger(TrainsFrameworkAdapter).warning(str(ex))
        return PatchTensorFlowEager.__original_fn_image(writer, step, tag, tensor, bad_color, max_images, name,
                                                        **kwargs)


class PatchKerasModelIO(object):
    __main_task = None
    __patched = None

    @staticmethod
    def update_current_task(task, **kwargs):
        PatchKerasModelIO.__main_task = task
        PatchKerasModelIO._patch_model_checkpoint()
        PostImportHookPatching.add_on_import('tensorflow', PatchKerasModelIO._patch_model_checkpoint)
        PostImportHookPatching.add_on_import('keras', PatchKerasModelIO._patch_model_checkpoint)

    @staticmethod
    def _patch_model_checkpoint():
        if 'keras' in sys.modules:
            try:
                from keras.engine.network import Network
            except ImportError:
                Network = None
            try:
                from keras.engine.sequential import Sequential
            except ImportError:
                Sequential = None
            try:
                from keras import models as keras_saving
            except ImportError:
                keras_saving = None
            PatchKerasModelIO._patch_io_calls(Network, Sequential, keras_saving)
        if 'tensorflow' in sys.modules:
            try:
                # hack: make sure tensorflow.__init__ is called
                import tensorflow
                from tensorflow.python.keras.engine.network import Network
            except ImportError:
                Network = None
            try:
                # hack: make sure tensorflow.__init__ is called
                import tensorflow
                from tensorflow.python.keras.engine.sequential import Sequential
            except ImportError:
                Sequential = None
            try:
                # hack: make sure tensorflow.__init__ is called
                import tensorflow
                from tensorflow.python.keras import models as keras_saving
            except ImportError:
                keras_saving = None
            PatchKerasModelIO._patch_io_calls(Network, Sequential, keras_saving)

    @staticmethod
    def _patch_io_calls(Network, Sequential, keras_saving):
        try:
            # only patch once
            if not PatchKerasModelIO.__patched:
                PatchKerasModelIO.__patched = True
                if Sequential is not None:
                    Sequential._updated_config = _patched_call(Sequential._updated_config,
                                                               PatchKerasModelIO._updated_config)
                    Sequential.from_config = _patched_call(Sequential.from_config, PatchKerasModelIO._from_config)

                if Network is not None:
                    Network._updated_config = _patched_call(Network._updated_config, PatchKerasModelIO._updated_config)
                    Network.from_config = _patched_call(Network.from_config, PatchKerasModelIO._from_config)
                    Network.save = _patched_call(Network.save, PatchKerasModelIO._save)
                    Network.save_weights = _patched_call(Network.save_weights, PatchKerasModelIO._save_weights)
                    Network.load_weights = _patched_call(Network.load_weights, PatchKerasModelIO._load_weights)

                if keras_saving is not None:
                    keras_saving.save_model = _patched_call(keras_saving.save_model, PatchKerasModelIO._save_model)
                    keras_saving.load_model = _patched_call(keras_saving.load_model, PatchKerasModelIO._load_model)
        except Exception as ex:
            getLogger(TrainsFrameworkAdapter).warning(str(ex))

    @staticmethod
    def _updated_config(original_fn, self):
        config = original_fn(self)
        # check if we have main task
        if PatchKerasModelIO.__main_task is None:
            return config

        try:
            # check if object already has InputModel
            if not hasattr(self, 'trains_out_model'):
                self.trains_out_model = None

            # check if object already has InputModel
            model_name_id = config.get('name', getattr(self, 'name', 'unknown'))
            if self.trains_out_model is not None:
                self.trains_out_model.config_dict = config
            else:
                # todo: support multiple models for the same task
                self.trains_out_model = OutputModel(
                    task=PatchKerasModelIO.__main_task,
                    config_dict=config,
                    name=PatchKerasModelIO.__main_task.name + ' ' + model_name_id,
                    label_enumeration=PatchKerasModelIO.__main_task.get_labels_enumeration(),
                    framework=Framework.keras,
                )
        except Exception as ex:
            getLogger(TrainsFrameworkAdapter).warning(str(ex))

        return config

    @staticmethod
    def _from_config(original_fn, *args, **kwargs):
        try:
            self = original_fn(*args, **kwargs)
        except Exception as ex:
            if not running_remotely():
                raise ex
            self = _Empty()

        # check if we have main task
        if PatchKerasModelIO.__main_task is None:
            return self

        try:
            # check if object already has InputModel
            if not hasattr(self, 'trains_in_model'):
                self.trains_in_model = None

            # get config
            config_dict = kwargs['config'] if 'config' in kwargs else args[0]
            # check if object already has InputModel
            self.trains_in_model = InputModel.empty(
                config_dict=config_dict,
                label_enumeration=PatchKerasModelIO.__main_task.get_labels_enumeration(),
            )
            # todo: support multiple models for the same task
            PatchKerasModelIO.__main_task.connect(self.trains_in_model)
            # if we are running remotely we should deserialize the object
            # because someone might have changed the configuration
            if running_remotely():
                # reload the model
                model_config = self.trains_in_model.config_dict
                # verify that this is the same model so we are not deserializing a diff model
                if (config_dict and config_dict.get('config') and model_config and model_config.get('config') and
                    config_dict.get('config').get('name') == model_config.get('config').get('name')) or \
                        (not config_dict and not model_config):
                    if 'config' in kwargs:
                        kwargs['config'] = model_config
                    else:
                        args = (model_config,) + args[1:]
                    model = original_fn(*args, **kwargs)
                    model.trains_in_model = self.trains_in_model
                    return model

        except Exception as ex:
            getLogger(TrainsFrameworkAdapter).warning(str(ex))

        return self

    @staticmethod
    def _load_weights(original_fn, self, *args, **kwargs):
        # check if we have main task
        if PatchKerasModelIO.__main_task is None:
            return original_fn(self, *args, **kwargs)

        # get filepath
        filepath = kwargs['filepath'] if 'filepath' in kwargs else args[0]
        if running_remotely():
            # register/load model weights
            filepath = WeightsFileHandler.restore_weights_file(self, filepath, Framework.keras,
                                                               PatchKerasModelIO.__main_task)
            if 'filepath' in kwargs:
                kwargs['filepath'] = filepath
            else:
                args = (filepath,) + args[1:]
            # load model
            return original_fn(self, *args, **kwargs)

        # try to load the files, if something happened exception will be raised before we register the file
        model = original_fn(self, *args, **kwargs)
        # register/load model weights
        WeightsFileHandler.restore_weights_file(self, filepath, Framework.keras, PatchKerasModelIO.__main_task)
        return model

    @staticmethod
    def _save(original_fn, self, *args, **kwargs):
        if hasattr(self, 'trains_out_model'):
            self.trains_out_model._processed = False
        original_fn(self, *args, **kwargs)
        # no need to specially call, because the original save uses "save_model" which we overload
        if not hasattr(self, 'trains_out_model') or not self.trains_out_model._processed:
            PatchKerasModelIO._update_outputmodel(self, *args, **kwargs)

    @staticmethod
    def _save_weights(original_fn, self, *args, **kwargs):
        original_fn(self, *args, **kwargs)
        PatchKerasModelIO._update_outputmodel(self, *args, **kwargs)

    @staticmethod
    def _update_outputmodel(self, *args, **kwargs):
        # check if we have main task
        if PatchKerasModelIO.__main_task is None:
            return

        try:
            # get filepath
            filepath = kwargs['filepath'] if 'filepath' in kwargs else args[0]

            # this will already generate an output model
            config = self._updated_config()

            # check if object already has InputModel
            if not hasattr(self, 'trains_out_model'):
                self.trains_out_model = None

            # check if object already has InputModel
            if self.trains_out_model is not None:
                self.trains_out_model.config_dict = config
            else:
                model_name_id = getattr(self, 'name', 'unknown')
                # todo: support multiple models for the same task
                self.trains_out_model = OutputModel(
                    task=PatchKerasModelIO.__main_task,
                    config_dict=config,
                    name=PatchKerasModelIO.__main_task.name + ' ' + model_name_id,
                    label_enumeration=PatchKerasModelIO.__main_task.get_labels_enumeration(),
                    framework=Framework.keras,
                )
            # check if we have output storage
            if self.trains_out_model.upload_storage_uri:
                self.trains_out_model.update_weights(weights_filename=filepath, auto_delete_file=False)
            else:
                self.trains_out_model.update_weights(weights_filename=None, register_uri=filepath)
            # if anyone asks, we were here
            self.trains_out_model._processed = True
        except Exception as ex:
            getLogger(TrainsFrameworkAdapter).warning(str(ex))

    @staticmethod
    def _save_model(original_fn, model, filepath, *args, **kwargs):
        original_fn(model, filepath, *args, **kwargs)
        if PatchKerasModelIO.__main_task:
            PatchKerasModelIO._update_outputmodel(model, filepath)

    @staticmethod
    def _load_model(original_fn, filepath, *args, **kwargs):
        if not PatchKerasModelIO.__main_task:
            return original_fn(filepath, *args, **kwargs)

        empty = _Empty()
        if running_remotely():
            # register/load model weights
            filepath = WeightsFileHandler.restore_weights_file(empty, filepath, Framework.keras,
                                                               PatchKerasModelIO.__main_task)
            model = original_fn(filepath, *args, **kwargs)
        else:
            model = original_fn(filepath, *args, **kwargs)
            # register/load model weights
            WeightsFileHandler.restore_weights_file(empty, filepath, Framework.keras, PatchKerasModelIO.__main_task)
        # update the input model object
        if empty.trains_in_model:
            try:
                model.trains_in_model = empty.trains_in_model
            except Exception:
                pass

        return model


class PatchTensorflowModelIO(object):
    __main_task = None
    __patched = None

    @staticmethod
    def update_current_task(task, **kwargs):
        PatchTensorflowModelIO.__main_task = task
        PatchTensorflowModelIO._patch_model_checkpoint()
        PostImportHookPatching.add_on_import('tensorflow', PatchTensorflowModelIO._patch_model_checkpoint)

    @staticmethod
    def _patch_model_checkpoint():
        if PatchTensorflowModelIO.__patched:
            return

        if 'tensorflow' not in sys.modules:
            return

        PatchTensorflowModelIO.__patched = True

        try:
            # hack: make sure tensorflow.__init__ is called
            import tensorflow
            from tensorflow.python.training.saver import Saver
            try:
                Saver.save = _patched_call(Saver.save, PatchTensorflowModelIO._save)
            except Exception:
                pass
            try:
                Saver.restore = _patched_call(Saver.restore, PatchTensorflowModelIO._restore)
            except Exception:
                pass
        except ImportError:
            pass
        except Exception:
            pass  # print('Failed patching tensorflow')

        try:
            # make sure we import the correct version of save
            import tensorflow
            from tensorflow.saved_model.experimental import save
            # actual import
            import tensorflow.saved_model.experimental as saved_model
        except ImportError:
            try:
                # make sure we import the correct version of save
                import tensorflow
                from tensorflow.saved_model import save
                # actual import
                import tensorflow.saved_mode as saved_model
            except ImportError:
                saved_model = None
            except Exception:
                saved_model = None
                pass  # print('Failed patching tensorflow')
        except Exception:
            saved_model = None
            pass  # print('Failed patching tensorflow')

        if saved_model is not None:
            saved_model.save = _patched_call(saved_model.save, PatchTensorflowModelIO._save_model)

        try:
            # make sure we import the correct version of save
            import tensorflow
            # actual import
            from tensorflow.saved_model import load
            import tensorflow.saved_model as saved_model_load
            saved_model_load.load = _patched_call(saved_model_load.load, PatchTensorflowModelIO._load)
        except ImportError:
            pass
        except Exception:
            pass  # print('Failed patching tensorflow')

        try:
            # make sure we import the correct version of save
            import tensorflow
            # actual import
            from tensorflow.saved_model import loader as loader1
            loader1.load = _patched_call(loader1.load, PatchTensorflowModelIO._load)
        except ImportError:
            pass
        except Exception:
            pass  # print('Failed patching tensorflow')

        try:
            # make sure we import the correct version of save
            import tensorflow
            # actual import
            from tensorflow.compat.v1.saved_model import loader as loader2
            loader2.load = _patched_call(loader2.load, PatchTensorflowModelIO._load)
        except ImportError:
            pass
        except Exception:
            pass  # print('Failed patching tensorflow')

        try:
            import tensorflow
            from tensorflow.train import Checkpoint
            try:
                Checkpoint.save = _patched_call(Checkpoint.save, PatchTensorflowModelIO._ckpt_save)
            except Exception:
                pass
            try:
                Checkpoint.restore = _patched_call(Checkpoint.restore, PatchTensorflowModelIO._ckpt_restore)
            except Exception:
                pass
            try:
                Checkpoint.write = _patched_call(Checkpoint.write, PatchTensorflowModelIO._ckpt_write)
            except Exception:
                pass
        except ImportError:
            pass
        except Exception:
            pass  # print('Failed patching tensorflow')

    @staticmethod
    def _save(original_fn, self, sess, save_path, *args, **kwargs):
        saved_path = original_fn(self, sess, save_path, *args, **kwargs)
        if not saved_path:
            return saved_path
        # store output Model
        return WeightsFileHandler.create_output_model(self, saved_path, Framework.tensorflow,
                                                      PatchTensorflowModelIO.__main_task)

    @staticmethod
    def _save_model(original_fn, obj, export_dir,  *args, **kwargs):
        original_fn(obj, export_dir,  *args, **kwargs)
        # store output Model
        WeightsFileHandler.create_output_model(obj, export_dir, Framework.tensorflow,
                                               PatchTensorflowModelIO.__main_task)

    @staticmethod
    def _restore(original_fn, self, sess, save_path, *args, **kwargs):
        if PatchTensorflowModelIO.__main_task is None:
            return original_fn(self, sess, save_path, *args, **kwargs)

        if running_remotely():
            # register/load model weights
            save_path = WeightsFileHandler.restore_weights_file(self, save_path, Framework.tensorflow,
                                                                PatchTensorflowModelIO.__main_task)
            # load model
            return original_fn(self, sess, save_path, *args, **kwargs)

        # load model, if something is wrong, exception will be raised before we register the input model
        model = original_fn(self, sess, save_path, *args, **kwargs)
        # register/load model weights
        WeightsFileHandler.restore_weights_file(self, save_path, Framework.tensorflow,
                                                PatchTensorflowModelIO.__main_task)
        return model

    @staticmethod
    def _load(original_fn, sess, tags, export_dir, *args, **saver_kwargs):
        if PatchTensorflowModelIO.__main_task is None:
            return original_fn(sess, tags, export_dir, *args, **saver_kwargs)

        # register input model
        empty = _Empty()
        if running_remotely():
            export_dir = WeightsFileHandler.restore_weights_file(empty, export_dir, Framework.tensorflow,
                                                                 PatchTensorflowModelIO.__main_task)
            model = original_fn(sess, tags, export_dir, *args, **saver_kwargs)
        else:
            # try to load model before registering, it might fail
            model = original_fn(sess, tags, export_dir, *args, **saver_kwargs)
            WeightsFileHandler.restore_weights_file(empty, export_dir, Framework.tensorflow,
                                                    PatchTensorflowModelIO.__main_task)

        if empty.trains_in_model:
            try:
                model.trains_in_model = empty.trains_in_model
            except Exception:
                pass
        return model

    @staticmethod
    def _ckpt_save(original_fn, self, file_prefix, *args, **kwargs):
        checkpoint_path = original_fn(self, file_prefix, *args, **kwargs)
        if PatchTensorflowModelIO.__main_task is None:
            return checkpoint_path
        WeightsFileHandler.create_output_model(self, checkpoint_path, Framework.tensorflow,
                                               PatchTensorflowModelIO.__main_task)
        return checkpoint_path

    @staticmethod
    def _ckpt_write(original_fn, self, file_prefix, *args, **kwargs):
        checkpoint_path = original_fn(self, file_prefix, *args, **kwargs)
        if PatchTensorflowModelIO.__main_task is None:
            return checkpoint_path
        WeightsFileHandler.create_output_model(self, checkpoint_path, Framework.tensorflow,
                                               PatchTensorflowModelIO.__main_task)
        return checkpoint_path

    @staticmethod
    def _ckpt_restore(original_fn, self, save_path, *args, **kwargs):
        if PatchTensorflowModelIO.__main_task is None:
            return original_fn(self, save_path, *args, **kwargs)

        # register input model
        empty = _Empty()
        if running_remotely():
            save_path = WeightsFileHandler.restore_weights_file(empty, save_path, Framework.tensorflow,
                                                                PatchTensorflowModelIO.__main_task)
            model = original_fn(self, save_path, *args, **kwargs)
        else:
            # try to load model before registering it, in case it fails.
            model = original_fn(self, save_path, *args, **kwargs)
            WeightsFileHandler.restore_weights_file(empty, save_path, Framework.tensorflow,
                                                    PatchTensorflowModelIO.__main_task)

        if empty.trains_in_model:
            try:
                model.trains_in_model = empty.trains_in_model
            except Exception:
                pass
        return model


class PatchPyTorchModelIO(object):
    __main_task = None
    __patched = None

    @staticmethod
    def update_current_task(task, **kwargs):
        PatchPyTorchModelIO.__main_task = task
        PatchPyTorchModelIO._patch_model_io()
        PostImportHookPatching.add_on_import('torch', PatchPyTorchModelIO._patch_model_io)

    @staticmethod
    def _patch_model_io():
        if PatchPyTorchModelIO.__patched:
            return

        if 'torch' not in sys.modules:
            return

        PatchPyTorchModelIO.__patched = True

        try:
            # hack: make sure tensorflow.__init__ is called
            import torch
            torch.save = _patched_call(torch.save, PatchPyTorchModelIO._save)
            torch.load = _patched_call(torch.load, PatchPyTorchModelIO._load)
        except ImportError:
            pass
        except Exception:
            pass  # print('Failed patching pytorch')

    @staticmethod
    def _save(original_fn, obj, f, *args, **kwargs):
        ret = original_fn(obj, f, *args, **kwargs)
        if not PatchPyTorchModelIO.__main_task:
            return ret

        if isinstance(f, six.string_types):
            filename = f
        elif hasattr(f, 'name'):
            filename = f.name
            try:
                f.flush()
            except Exception:
                pass
        else:
            filename = None

        # if the model a screptive name based on the file name
        try:
            model_name = Path(filename).stem
        except Exception:
            model_name = None
        WeightsFileHandler.create_output_model(obj, filename, Framework.pytorch, PatchPyTorchModelIO.__main_task,
                                               singlefile=True, model_name=model_name)
        return ret

    @staticmethod
    def _load(original_fn, f, *args, **kwargs):
        if isinstance(f, six.string_types):
            filename = f
        elif hasattr(f, 'name'):
            filename = f.name
        else:
            filename = None

        if not PatchPyTorchModelIO.__main_task:
            return original_fn(f, *args, **kwargs)

        # register input model
        empty = _Empty()
        if running_remotely():
            filename = WeightsFileHandler.restore_weights_file(empty, filename, Framework.pytorch,
                                                               PatchPyTorchModelIO.__main_task)
            model = original_fn(filename or f, *args, **kwargs)
        else:
            # try to load model before registering, in case we fail
            model = original_fn(filename or f, *args, **kwargs)
            WeightsFileHandler.restore_weights_file(empty, filename, Framework.pytorch,
                                                    PatchPyTorchModelIO.__main_task)

        if empty.trains_in_model:
            try:
                model.trains_in_model = empty.trains_in_model
            except Exception:
                pass
        return model