This document is relevant for: Trn1, Trn2, Trn3

nki.language.rsqrt#

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

Reciprocal of the square-root of the input, element-wise.

((Similar to torch.rsqrt))

Warning

This API is experimental and may change in future releases.

rsqrt(x) = 1 / sqrt(x)

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 reciprocal square-root values of x.

Examples:

import nki.language as nl

# nki.language.rsqrt -- rsqrt(4.0) = 0.5
a = nl.full((128, 512), 4.0, dtype=nl.float32,
            buffer=nl.sbuf)
b = nl.rsqrt(a)
expected = nl.full((128, 512), 0.5, dtype=nl.float32,
                   buffer=nl.sbuf)
assert nl.equal(b, expected)

This document is relevant for: Trn1, Trn2, Trn3