Casts a tensor to type `bfloat16`. Args: x: A `Tensor` or `SparseTensor`. name: A name for the operation (optional). Returns: A `Tensor` or `SparseTensor` with same shape as `x` with type `bfloat16`. Raises: TypeError: If `x` cannot be cast to the `bfloat16`.
(x, name="ToBFloat16")
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