This document is relevant for: Trn1, Trn2, Trn3

nki.language.log#

nki.language.log(x, dtype=None)[source]#

Natural logarithm of the input, element-wise.

((Similar to numpy.log))

Warning

This API is experimental and may change in future releases.

It is the inverse of the exponential function, such that: log(exp(x)) = x . The natural logarithm base is e.

Parameters:

  • x – a tile.

  • dtype – (optional) data type to cast the output type to (see Supported Data Types for more information); if not specified, it will default to be the same as the data type of the input tile.

Returns:

a tile that has natural logarithm values of x.

Examples:

import nki.language as nl

# nki.language.log -- log(1.0) = 0.0
a = nl.full((128, 512), 1.0, dtype=nl.float32, buffer=nl.sbuf)
b = nl.log(a)
expected = nl.full((128, 512), 0.0, dtype=nl.float32, buffer=nl.sbuf)
assert nl.equal(b, expected)

This document is relevant for: Trn1, Trn2, Trn3