1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "HashtableLookup.h"
18
19 #include "CpuExecutor.h"
20 #include "HalInterfaces.h"
21 #include "Operations.h"
22
23 namespace android {
24 namespace nn {
25
26 namespace {
27
greater(const void * a,const void * b)28 int greater(const void* a, const void* b) {
29 return *static_cast<const int*>(a) - *static_cast<const int*>(b);
30 }
31
32 } // anonymous namespace
33
HashtableLookup(const Operation & operation,std::vector<RunTimeOperandInfo> & operands)34 HashtableLookup::HashtableLookup(const Operation& operation,
35 std::vector<RunTimeOperandInfo>& operands) {
36 lookup_ = GetInput(operation, operands, kLookupTensor);
37 key_ = GetInput(operation, operands, kKeyTensor);
38 value_ = GetInput(operation, operands, kValueTensor);
39
40 output_ = GetOutput(operation, operands, kOutputTensor);
41 hits_ = GetOutput(operation, operands, kHitsTensor);
42 }
43
Eval()44 bool HashtableLookup::Eval() {
45 const int num_rows = value_->shape().dimensions[0];
46 const int row_bytes = sizeOfData(value_->type, value_->dimensions) / num_rows;
47 void* pointer = nullptr;
48
49 for (int i = 0; i < static_cast<int>(lookup_->shape().dimensions[0]); i++) {
50 int idx = -1;
51 pointer = bsearch(lookup_->buffer + sizeof(int) * i, key_->buffer,
52 num_rows, sizeof(int), greater);
53 if (pointer != nullptr) {
54 idx =
55 (reinterpret_cast<uint8_t*>(pointer) - key_->buffer) / sizeof(float);
56 }
57
58 if (idx >= num_rows || idx < 0) {
59 memset(output_->buffer + i * row_bytes, 0, row_bytes);
60 hits_->buffer[i] = 0;
61 } else {
62 memcpy(output_->buffer + i * row_bytes, value_->buffer + idx * row_bytes,
63 row_bytes);
64 hits_->buffer[i] = 1;
65 }
66 }
67
68 return true;
69 }
70
71 } // namespace nn
72 } // namespace android
73