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import os
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import pickle
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def load_class_map(map_or_filename, root=''):
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if isinstance(map_or_filename, dict):
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assert dict, 'class_map dict must be non-empty'
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return map_or_filename
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class_map_path = map_or_filename
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if not os.path.exists(class_map_path):
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class_map_path = os.path.join(root, class_map_path)
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assert os.path.exists(class_map_path), 'Cannot locate specified class map file (%s)' % map_or_filename
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class_map_ext = os.path.splitext(map_or_filename)[-1].lower()
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if class_map_ext == '.txt':
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with open(class_map_path) as f:
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class_to_idx = {v.strip(): k for k, v in enumerate(f)}
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elif class_map_ext == '.pkl':
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with open(class_map_path, 'rb') as f:
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class_to_idx = pickle.load(f)
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else:
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assert False, f'Unsupported class map file extension ({class_map_ext}).'
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return class_to_idx
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