tf.contrib.layers.check_feature_columns(feature_columns)See the guide: Layers (contrib) > Feature columns
Checks the validity of the set of FeatureColumns.
feature_columns: A set of instances or subclasses of FeatureColumn.ValueError: If there are duplicate feature column keys.Defined in tensorflow/contrib/layers/python/layers/feature_column_ops.py.
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https://www.tensorflow.org/api_docs/python/tf/contrib/layers/check_feature_columns