Add FastAI example, disable binding if tensorboard is loaded (assume TensorBoradLogger will be used)

examples/frameworks/fastai/fastai_with_tensorboard.py

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+# TRAINS - Fastai with Tensorboard example code, automatic logging the model and Tensorboard outputs
+#
+
+from fastai.callbacks.tensorboard import LearnerTensorboardWriter
+from fastai.vision import *  # Quick access to computer vision functionality
+
+from trains import Task
+
+task = Task.init(project_name="example", task_name="fastai with tensorboard callback")
+
+path = untar_data(URLs.MNIST_SAMPLE)
+
+data = ImageDataBunch.from_folder(path, ds_tfms=(rand_pad(2, 28), []), bs=64)
+data.normalize(imagenet_stats)
+
+learn = cnn_learner(data, models.resnet18, metrics=accuracy)
+tboard_path = Path("data/tensorboard/project1")
+learn.callback_fns.append(
+    partial(LearnerTensorboardWriter, base_dir=tboard_path, name="run0")
+)
+
+accuracy(*learn.get_preds())
+learn.fit_one_cycle(6, 0.01)

examples/frameworks/fastai/requirements.txt

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+fastai