tensorflow::ops::Bitcast

Bitcasts a tensor from one type to another without copying data.

Summary

Given a tensor input, this operation returns a tensor that has the same buffer data as input with datatype type.

If the input datatype T is larger than the output datatype type then the shape changes from [...] to [..., sizeof(T)/sizeof(type)].

If T is smaller than type, the operator requires that the rightmost dimension be equal to sizeof(type)/sizeof(T). The shape then goes from [..., sizeof(type)/sizeof(T)] to [...].

tf.bitcast() and tf.cast() work differently when real dtype is casted as a complex dtype (e.g. tf.complex64 or tf.complex128) as tf.cast() make imaginary part 0 while tf.bitcast() gives module error. For example,

Example 1:

a = [1., 2., 3.] equality_bitcast = tf.bitcast(a, tf.complex128) Traceback (most recent call last): ... InvalidArgumentError: Cannot bitcast from 1 to 18 [Op:Bitcast] equality_cast = tf.cast(a, tf.complex128) print(equality_cast) tf.Tensor([1.+0.j 2.+0.j 3.+0.j], shape=(3,), dtype=complex128)

Example 2:

tf.bitcast(tf.constant(0xffffffff, dtype=tf.uint32), tf.uint8)

Example 3:

x = [1., 2., 3.] y = [0., 2., 3.] equality= tf.equal(x,y) equality_cast = tf.cast(equality,tf.float32) equality_bitcast = tf.bitcast(equality_cast,tf.uint8) print(equality) tf.Tensor([False True True], shape=(3,), dtype=bool) print(equality_cast) tf.Tensor([0. 1. 1.], shape=(3,), dtype=float32) print(equality_bitcast) tf.Tensor( [[ 0 0 0 0] [ 0 0 128 63] [ 0 0 128 63]], shape=(3, 4), dtype=uint8)

NOTE: Bitcast is implemented as a low-level cast, so machines with different endian orderings will give different results. A copy from input buffer to output buffer is made on BE machines when types are of different sizes in order to get the same casting results as on LE machines.

Args:

• scope: A Scope object

Returns:

• Output: The output tensor.

Public attributes

Operation operation

::tensorflow::Output output

Public functions

 Bitcast(
  const ::tensorflow::Scope & scope,
  ::tensorflow::Input input,
  DataType type
)

::tensorflow::Node * node() const 

 operator::tensorflow::Input() const 

 operator::tensorflow::Output() const