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Stacks the input, if it admits the notion of stacking.

For example, a list of tensors can be stacked into a larger tensor. This function is similar to tf.stack, but it accepts non-lists and lists of non-tensors as arguments. In the latter case, the function does nothing.

list_or_tensor Any
element_dtype tf.DType, optional dtypedtype for the elements in the list. Required if the input is stackable, and the list is untyped.
strict bool, if True an error is raised if the input is not stackable. Otherwise the function is a no-op.

Any, if the input is stackable, the result will be a tf.Tensor. Otherwise, if strict=False, the result will be list_or_tensor.

ValueError if strict=True and the input is not stackable.