1/*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19
20/*!
21 * \file gradient.h
22 * \brief Utility functions for Automatic Differentiation in Relay.
23 */
24#ifndef TVM_RELAY_TRANSFORMS_GRADIENT_H_
25#define TVM_RELAY_TRANSFORMS_GRADIENT_H_
26
27#include <tvm/relay/expr.h>
28#include <tvm/relay/function.h>
29
30#include <vector>
31
32namespace tvm {
33namespace relay {
34
35inline Type GradRetType(const Function& f) {
36 // if type annotations are provided, we will construct a ret type;
37 // otherwise, leave it to be inferred
38 if (!f->ret_type.defined()) {
39 return Type();
40 }
41 std::vector<Type> vt;
42 for (const auto& p : f->params) {
43 if (!p->type_annotation.defined()) {
44 return Type();
45 }
46 vt.push_back(p->type_annotation);
47 }
48
49 return TupleType({f->ret_type, TupleType(vt)});
50}
51
52} // namespace relay
53} // namespace tvm
54#endif // TVM_RELAY_TRANSFORMS_GRADIENT_H_
55