torch/onnx/symbolic_opset17.py

"""This file exports ONNX ops for opset 17.

Note [ONNX Operators that are added/updated in opset 17]

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
https://github.com/onnx/onnx/blob/main/docs/Changelog.md#version-17-of-the-default-onnx-operator-set
New operators:
    BlackmanWindow
    DFT
    HammingWindow
    HannWindow
    LayerNormalization
    MelWeightMatrix
    STFT
    SequenceMap
"""

import functools
from typing import Sequence

from torch import _C
from torch.onnx import symbolic_helper
from torch.onnx._internal import jit_utils, registration

# EDITING THIS FILE? READ THIS FIRST!
# see Note [Edit Symbolic Files] in README.md

__all__ = ["layer_norm"]

_onnx_symbolic = functools.partial(registration.onnx_symbolic, opset=17)


@_onnx_symbolic("aten::layer_norm")
@symbolic_helper.parse_args("v", "is", "v", "v", "f", "none")
def layer_norm(
    g: jit_utils.GraphContext,
    input: _C.Value,
    normalized_shape: Sequence[int],
    weight: _C.Value,
    bias: _C.Value,
    eps: float,
    cudnn_enable: bool,
):
    # normalized_shape: input shape from an expected input of size
    # axis: The first normalization dimension.
    # layer_norm normalizes on the last D dimensions,
    # where D is the size of normalized_shape
    axis = -len(normalized_shape)
    return g.op(
        "LayerNormalization",
        input,
        weight,
        bias,
        epsilon_f=eps,
        axis_i=axis,
    )