Parses a JSON tokenizer configuration file and returns a
tf.keras.preprocessing.text.tokenizer_from_json( json_string )
tokenizer instance.
json_string: JSON string encoding a tokenizer configuration.
A Keras Tokenizer instance
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Code samples licensed under the Apache 2.0 License.
https://www.tensorflow.org/versions/r2.3/api_docs/python/tf/keras/preprocessing/text/tokenizer_from_json