error with filter

Reference:
https://stackoverflow.com/questions/15876259/typeerror-filter-object-is-not-subscriptable?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa

models.py

@@ -256,7 +256,7 @@ def _construct_diff_model(self, base_model, keep_rgb=False):
         # Torch models are usually defined in a hierarchical way.
         # nn.modules.children() return all sub modules in a DFS manner
         modules = list(self.base_model.modules())
-        first_conv_idx = filter(lambda x: isinstance(modules[x], nn.Conv2d), list(range(len(modules))))[0]
+        first_conv_idx = list(filter(lambda x: isinstance(modules[x], nn.Conv2d), list(range(len(modules)))))[0]
         conv_layer = modules[first_conv_idx]
         container = modules[first_conv_idx - 1]
 
@@ -301,4 +301,4 @@ def get_augmentation(self):
                                                    GroupRandomHorizontalFlip(is_flow=True)])
         elif self.modality == 'RGBDiff':
             return torchvision.transforms.Compose([GroupMultiScaleCrop(self.input_size, [1, .875, .75]),
-                                                   GroupRandomHorizontalFlip(is_flow=False)])
+                                                   GroupRandomHorizontalFlip(is_flow=False)])