*Last updated: 2023-03-16.*
# tf_quant_finance.math.qmc.utils.log2
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Returns the point-wise base-2 logarithm a given `Tensor`.
```python
tf_quant_finance.math.qmc.utils.log2(
value
)
```
```python
import tensorflow as tf
import tf_quant_finance as tff
# Example: Computing the base-2 logarithm of a given vector.
tff.math.qmc.utils.log2(tf.constant([1, 2, 4, 8, 16], dtype=tf.float32))
# ==> tf.Tensor([0., 1., 2., 3., 4.], shape=(5,), dtype=float32)
```
#### Args:
* `value`: Positive scalar `Tensor` of real values.
#### Returns:
`Tensor` with the same `shape` and `dtype` as `value` equal to `ln(value) /
ln(2)`.