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import os
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def load_class_map(filename, root=''):
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class_map_path = filename
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if not os.path.exists(class_map_path):
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class_map_path = os.path.join(root, filename)
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assert os.path.exists(class_map_path), 'Cannot locate specified class map file (%s)' % filename
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class_map_ext = os.path.splitext(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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else:
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assert False, 'Unsupported class map extension'
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return class_to_idx
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