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TensorFlow 1 version
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Bitcasts a tensor from one type to another without copying data.
tf.bitcast(
input, type, name=None
)
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)<tf.Tensor: shape=(4,), dtype=uint8, numpy=array([255, 255, 255, 255], dtype=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)
Args | |
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input
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A Tensor. Must be one of the following types: bfloat16, half, float32, float64, int64, int32, uint8, uint16, uint32, uint64, int8, int16, complex64, complex128, qint8, quint8, qint16, quint16, qint32.
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type
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A tf.DType from: tf.bfloat16, tf.half, tf.float32, tf.float64, tf.int64, tf.int32, tf.uint8, tf.uint16, tf.uint32, tf.uint64, tf.int8, tf.int16, tf.complex64, tf.complex128, tf.qint8, tf.quint8, tf.qint16, tf.quint16, tf.qint32.
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name
|
A name for the operation (optional). |
Returns | |
|---|---|
A Tensor of type type.
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