1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/permissions/prediction_service/prediction_model_executor.h"
#include "base/notreached.h"
#include "components/permissions/prediction_service/prediction_common.h"
#include "components/permissions/prediction_service/prediction_request_features.h"
#include "third_party/tflite_support/src/tensorflow_lite_support/cc/task/core/task_utils.h"
namespace permissions {
PredictionModelExecutorInput::PredictionModelExecutorInput() = default;
PredictionModelExecutorInput::~PredictionModelExecutorInput() = default;
PredictionModelExecutorInput::PredictionModelExecutorInput(
const PredictionModelExecutorInput&) = default;
PredictionModelExecutor::PredictionModelExecutor() = default;
PredictionModelExecutor::~PredictionModelExecutor() = default;
bool PredictionModelExecutor::Preprocess(
const std::vector<TfLiteTensor*>& input_tensors,
const PredictionModelExecutorInput& input) {
model_metadata_ = input.metadata;
switch (input.request.permission_features()[0].permission_type_case()) {
case PermissionFeatures::kNotificationPermission:
request_type_ = RequestType::kNotifications;
break;
case PermissionFeatures::kGeolocationPermission:
request_type_ = RequestType::kGeolocation;
break;
default:
NOTREACHED();
}
if (!tflite::task::core::PopulateTensor<float>(
input.request.client_features().client_stats().avg_deny_rate(),
input_tensors[0])
.ok()) {
return false;
}
if (!tflite::task::core::PopulateTensor<float>(
input.request.client_features().client_stats().avg_dismiss_rate(),
input_tensors[1])
.ok()) {
return false;
}
if (!tflite::task::core::PopulateTensor<float>(
input.request.client_features().client_stats().avg_grant_rate(),
input_tensors[2])
.ok()) {
return false;
}
if (!tflite::task::core::PopulateTensor<float>(
input.request.client_features().client_stats().avg_ignore_rate(),
input_tensors[3])
.ok()) {
return false;
}
if (!tflite::task::core::PopulateTensor<float>(
input.request.permission_features()[0]
.permission_stats()
.avg_deny_rate(),
input_tensors[4])
.ok()) {
return false;
}
if (!tflite::task::core::PopulateTensor<float>(
input.request.permission_features()[0]
.permission_stats()
.avg_dismiss_rate(),
input_tensors[5])
.ok()) {
return false;
}
if (!tflite::task::core::PopulateTensor<float>(
input.request.permission_features()[0]
.permission_stats()
.avg_grant_rate(),
input_tensors[6])
.ok()) {
return false;
}
if (!tflite::task::core::PopulateTensor<float>(
input.request.permission_features()[0]
.permission_stats()
.avg_ignore_rate(),
input_tensors[7])
.ok()) {
return false;
}
if (!tflite::task::core::PopulateTensor<int64_t>(
static_cast<int64_t>(input.request.permission_features()[0]
.permission_stats()
.prompts_count()),
input_tensors[8])
.ok()) {
return false;
}
if (!tflite::task::core::PopulateTensor<int64_t>(
static_cast<int64_t>(
input.request.client_features().client_stats().prompts_count()),
input_tensors[9])
.ok()) {
return false;
}
if (!tflite::task::core::PopulateTensor<int64_t>(
static_cast<int64_t>(input.request.client_features().gesture_enum()),
input_tensors[10])
.ok()) {
return false;
}
if (!tflite::task::core::PopulateTensor<int64_t>(
static_cast<int64_t>(
input.request.client_features().platform_enum()),
input_tensors[11])
.ok()) {
return false;
}
return true;
}
std::optional<GeneratePredictionsResponse> PredictionModelExecutor::Postprocess(
const std::vector<const TfLiteTensor*>& output_tensors) {
DCHECK(request_type_ == RequestType::kNotifications ||
request_type_ == RequestType::kGeolocation);
if (!model_metadata_ || !model_metadata_->has_not_grant_thresholds()) {
LOG(WARNING)
<< "[CPSS] Failed to read model thresholds from metadata";
return std::nullopt;
}
std::vector<float> data;
if (!tflite::task::core::PopulateVector<float>(output_tensors[0], &data)
.ok()) {
return std::nullopt;
}
// max_likely represents very likely to not grant
float threshold = model_metadata_->not_grant_thresholds().max_likely();
GeneratePredictionsResponse response;
response.mutable_prediction()
->Add()
->mutable_grant_likelihood()
->set_discretized_likelihood(
data[1] > threshold
? PermissionPrediction_Likelihood_DiscretizedLikelihood_VERY_UNLIKELY
: PermissionPrediction_Likelihood_DiscretizedLikelihood_DISCRETIZED_LIKELIHOOD_UNSPECIFIED);
return response;
}
} // namespace permissions
|
