Load PTB raw data from data directory "data_path". Reads PTB text files, converts strings to integer ids, and performs mini-batching of the inputs. The PTB dataset comes from Tomas Mikolov's webpage: http://www.fit.vutbr.cz/~imikolov/rnnlm/simple-examples.tgz Args: data_path: strin
(data_path=None)
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