Support pip 20.1 local/http package reference in pip freeze

trains_agent/helper/package/pytorch.py

@@ -435,6 +435,37 @@ class PytorchRequirement(SimpleSubstitution):
         self.log.debug('Replacing requirement "%s" with %r', req, result)
         return result
 
+    def replace_back(self, list_of_requirements):  # type: (Dict) -> Dict
+        """
+        :param list_of_requirements: {'pip': ['a==1.0', ]}
+        :return: {'pip': ['a==1.0', ]}
+        """
+        if not self._original_req:
+            return list_of_requirements
+        try:
+            for k, lines in list_of_requirements.items():
+                # k is either pip/conda
+                if k not in ('pip', 'conda'):
+                    continue
+                for i, line in enumerate(lines):
+                    if not line or line.lstrip().startswith('#'):
+                        continue
+                    parts = [p for p in re.split('\s|=|\.|<|>|~|!|@|#', line) if p]
+                    if not parts:
+                        continue
+                    for req, new_req in self._original_req:
+                        if req.req.name == parts[0]:
+                            # support for pip >= 20.1
+                            if '@' in line:
+                                lines[i] = '{} # {}'.format(str(req), str(new_req))
+                            else:
+                                lines[i] = '{} # {}'.format(line, str(new_req))
+                            break
+        except:
+            pass
+
+        return list_of_requirements
+
     MAP = {
         "windows": {
             "cuda100": {