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A transformation that scans a function across an input dataset.

    initial_state, scan_func

This transformation is a stateful relative of tf.data.Dataset.map. In addition to mapping scan_func across the elements of the input dataset, scan() accumulates one or more state tensors, whose initial values are initial_state.


  • initial_state: A nested structure of tensors, representing the initial state of the accumulator.
  • scan_func: A function that maps (old_state, input_element) to (new_state, output_element). It must take two arguments and return a pair of nested structures of tensors. Thenew_statemust match the structure ofinitial_state`.


A Dataset transformation function, which can be passed to tf.data.Dataset.apply.