[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

torch_points3d/applications/base_architectures/base_model.py

@@ -1,5 +1,6 @@
 import torch.nn as nn
 
+
 # This is the base class of the Backbone/API models, that provides useful functions to use within these models
 class BaseModel(nn.Module):
 

torch_points3d/utils/model_building_utils/resolver_utils.py

@@ -1,5 +1,6 @@
 import collections
 
+
 # from https://stackoverflow.com/questions/6027558/flatten-nested-dictionaries-compressing-keys
 # flattens nested dicts to a single dict, with keys concatenated
 # e.g. flatten_dict({'a': 1, 'c': {'a': 2, 'b': {'x': 5, 'y' : 10}}, 'd': [1, 2, 3]})