def _build(self, inputs): """Connects the MergeDims module into the graph. Args: inputs: Tensor or a nested list of Tensors to merge. Its rank must be greater than or equal to `start` + `size`. Returns: The merged Tensor or a nested list of merged Tensors. Raises: ValueError: If any of the `inputs` tensors has insufficient rank. """ if nest.is_sequence(inputs): merged_tensors = [self._merge(tensor) for tensor in nest.flatten(inputs)] return nest.pack_sequence_as(inputs, merged_tensors) # inputs is a single tf.Tensor return self._merge(inputs)