fusion_gelu_approximation.py

#-------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation.  All rights reserved.
# Licensed under the MIT License.
#--------------------------------------------------------------------------

from logging import getLogger
from onnx import helper
from onnx_model import OnnxModel
from fusion_base import Fusion


class FusionGeluApproximation(Fusion):
    def __init__(self, model: OnnxModel):
        super().__init__(model, 'FastGelu', ['Gelu', 'BiasGelu'], 'GeluApproximation')

    def fuse(self, node, input_name_to_nodes, output_name_to_node):
        new_node = helper.make_node("FastGelu",
                                    inputs=node.input,
                                    outputs=node.output,
                                    name=self.model.create_node_name("FastGelu", node.op_type + "_Approximation"))
        new_node.domain = "com.microsoft"
        self.nodes_to_remove.append(node)
        self.nodes_to_add.append(new_node)
        self.node_name_to_graph_name[new_node.name] = self.this_graph_name