wehub-resource-sync
66 lines
2.5 KiB
Python
66 lines
2.5 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
|
|
# or more contributor license agreements. See the NOTICE file
|
|
# distributed with this work for additional information
|
|
# regarding copyright ownership. The ASF licenses this file
|
|
# to you under the Apache License, Version 2.0 (the
|
|
# "License"); you may not use this file except in compliance
|
|
# with the License. You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing,
|
|
# software distributed under the License is distributed on an
|
|
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
# KIND, either express or implied. See the License for the
|
|
# specific language governing permissions and limitations
|
|
# under the License.
|
|
# pylint: disable=invalid-name, unused-argument, redefined-argument-from-local
|
|
"""Relax Use Fast Math pass."""
|
|
|
|
import tvm
|
|
from tvm import topi
|
|
from tvm.ir.module import IRModule
|
|
from tvm.relax import Call, Expr, PyExprMutator, expr_functor
|
|
|
|
|
|
@expr_functor.mutator
|
|
class FastMathCodeGenerator(PyExprMutator):
|
|
"""
|
|
Converts the expensive non linear functions to their fast but approximate counterparts.
|
|
|
|
Parameters
|
|
----------
|
|
mod: IRModule
|
|
The module to be transformed
|
|
"""
|
|
|
|
def __init__(self, mod):
|
|
super().__init__(mod)
|
|
|
|
def visit_call_(self, call: Call) -> Expr:
|
|
if call.op.name == "relax.nn.softmax":
|
|
return self.builder_.call_te(topi.nn.fast_softmax, call.args[0], call.attrs.axis)
|
|
if call.op.name == "relax.exp":
|
|
return self.builder_.call_te(topi.fast_exp, call.args[0])
|
|
if call.op.name == "relax.erf":
|
|
return self.builder_.call_te(topi.fast_erf, call.args[0])
|
|
if call.op.name == "relax.tanh":
|
|
return self.builder_.call_te(topi.fast_tanh, call.args[0])
|
|
|
|
return super().visit_call_(call)
|
|
|
|
|
|
@tvm.transform.module_pass(opt_level=0, name="FastMathTransform")
|
|
class FastMathTransform:
|
|
"""
|
|
Pass to convert the expensive non linear functions to their fast but approximate counterparts.
|
|
"""
|
|
|
|
def transform_module(self, mod: IRModule, ctx: tvm.transform.PassContext) -> IRModule:
|
|
fast_math_codegen = FastMathCodeGenerator(mod)
|
|
for gv, func in mod.functions_items():
|
|
if isinstance(func, tvm.relax.Function):
|
|
func = fast_math_codegen.visit_expr(func)
|
|
fast_math_codegen.builder_.update_func(gv, func)
|
|
return fast_math_codegen.builder_.get()
|