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Returns the cardinality of dataset, if known.



The operation returns the cardinality of dataset. The operation may return if dataset contains an infinite number of elements or if the analysis fails to determine the number of elements in dataset中恒配资网 (e.g. when the dataset source is a file).



A scalar tf.int64 Tensor representing the cardinality of dataset. If the cardinality is infinite or unknown, the operation returns the named constant INFINITE_CARDINALITY and UNKNOWN_CARDINALITY respectively.

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