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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
// Copyright 2015 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/dom_distiller/core/page_features.h"
#include <stddef.h>
#include <memory>
#include <optional>
#include <string>
#include <vector>
#include "base/files/file_util.h"
#include "base/json/json_reader.h"
#include "base/json/json_writer.h"
#include "base/path_service.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "url/gurl.h"
namespace dom_distiller {
namespace {
struct SiteDerivedFeatures {
std::string url;
std::vector<double> derived_features;
};
// Returns std::nullopt in case of failure.
std::optional<SiteDerivedFeatures> ParseSiteDerivedFeatures(
const base::Value& json) {
if (!json.is_dict())
return std::nullopt;
const std::string* url = json.GetDict().FindString("url");
if (!url)
return std::nullopt;
const base::Value::List* derived_features_json =
json.GetDict().FindList("features");
if (!derived_features_json)
return std::nullopt;
// For every feature name at index 2*N, their value is at 2*N+1. In particular
// the size must be an even number.
size_t size = derived_features_json->size();
if (size % 2 != 0)
return std::nullopt;
std::vector<double> derived_features;
for (size_t i = 1; i < size; i += 2) {
const base::Value& feature_value = (*derived_features_json)[i];
// If the value is a bool, convert it to 1.0 or 0.0.
double numerical_feature_value;
if (feature_value.is_double() || feature_value.is_int())
numerical_feature_value = feature_value.GetDouble();
else if (feature_value.is_bool())
numerical_feature_value = feature_value.GetBool();
else
return std::nullopt;
derived_features.push_back(numerical_feature_value);
}
return SiteDerivedFeatures{*url, derived_features};
}
// Reads a JSON "{[....]}" into a base::Value::List. Returns an empty
// list in case of failure.
base::Value::List ReadJsonList(const std::string& file_name) {
base::FilePath dir_src_test_data_root;
if (!base::PathService::Get(base::DIR_SRC_TEST_DATA_ROOT,
&dir_src_test_data_root)) {
return base::Value::List();
}
std::string raw_content;
bool read_success = base::ReadFileToString(
dir_src_test_data_root.AppendASCII(file_name), &raw_content);
if (!read_success)
return base::Value::List();
std::optional<base::Value> parsed_content =
base::JSONReader::Read(raw_content);
if (!parsed_content)
return base::Value::List();
if (!parsed_content->is_list())
return base::Value::List();
return std::move(*parsed_content).TakeList();
}
// This test uses input data of core features and the output of the training
// pipeline's derived feature extraction to ensure that the extraction that is
// done in Chromium matches that in the training pipeline.
TEST(DomDistillerPageFeaturesTest, TestCalculateDerivedFeatures) {
// Read the expectations file into a format convenient for testing.
const std::string kExpectationsFile =
"components/test/data/dom_distiller/derived_features.json";
std::vector<SiteDerivedFeatures> expected_sites_feature_info;
for (const base::Value& site_info : ReadJsonList(kExpectationsFile)) {
std::optional<SiteDerivedFeatures> parsed =
ParseSiteDerivedFeatures(site_info);
ASSERT_TRUE(parsed) << "Invalid expectation file";
expected_sites_feature_info.push_back(*parsed);
}
base::Value::List input_sites_feature_info =
ReadJsonList("components/test/data/dom_distiller/core_features.json");
ASSERT_FALSE(input_sites_feature_info.empty());
ASSERT_EQ(expected_sites_feature_info.size(),
input_sites_feature_info.size());
// Loop over |input_sites_feature_info| and |expected_sites_feature_info|
// simultaneously, compute the derived features and verify they match the
// expectation.
auto input_iter = input_sites_feature_info.begin();
auto expectation_iter = expected_sites_feature_info.begin();
for (; input_iter != input_sites_feature_info.end();
input_iter++, expectation_iter++) {
ASSERT_TRUE(input_iter->is_dict());
const auto& input_iter_dict = input_iter->GetDict();
ASSERT_TRUE(input_iter_dict.FindString("url"));
ASSERT_TRUE(input_iter_dict.FindDict("features"));
// The JSON must be stringified for CalculateDerivedFeaturesFromJSON().
base::Value stringified_json(base::Value::Type::STRING);
bool success = base::JSONWriter::Write(
*input_iter_dict.FindDict("features"), &stringified_json.GetString());
ASSERT_TRUE(success);
// Check the URL and the vector of features match the expectation.
EXPECT_EQ(expectation_iter->url, *input_iter_dict.FindString("url"));
EXPECT_EQ(expectation_iter->derived_features,
CalculateDerivedFeaturesFromJSON(&stringified_json));
}
}
std::vector<double> DeriveFromPath(const GURL& url) {
return CalculateDerivedFeatures(false, // bool openGraph
url, // const GURL& url
0, // unsigned elementCount
0, // unsigned anchorCount
0, // unsigned formCount
0, // double mozScore
0, // double mozScoreAllSqrt
0 // double mozScoreAllLinear
);
}
TEST(DomDistillerPageFeaturesTest, TestPath) {
GURL url("http://example.com/search/view/index/the-title-of-archive.php");
std::vector<double> derived(DeriveFromPath(url));
EXPECT_EQ(0, lround(derived[1]));
EXPECT_EQ(1, lround(derived[2]));
EXPECT_EQ(1, lround(derived[3]));
EXPECT_EQ(1, lround(derived[4]));
EXPECT_EQ(1, lround(derived[5]));
EXPECT_EQ(0, lround(derived[6]));
EXPECT_EQ(0, lround(derived[7]));
EXPECT_EQ(1, lround(derived[8]));
EXPECT_EQ(43, lround(derived[9]));
EXPECT_EQ(0, lround(derived[10]));
EXPECT_EQ(4, lround(derived[11]));
EXPECT_EQ(4, lround(derived[12]));
EXPECT_EQ(0, lround(derived[13]));
EXPECT_EQ(24, lround(derived[14]));
}
TEST(DomDistillerPageFeaturesTest, TestPath2) {
GURL url("http://example.com/phpbb/forum123/456.asp");
std::vector<double> derived(DeriveFromPath(url));
EXPECT_EQ(1, lround(derived[1]));
EXPECT_EQ(0, lround(derived[2]));
EXPECT_EQ(0, lround(derived[3]));
EXPECT_EQ(0, lround(derived[4]));
EXPECT_EQ(0, lround(derived[5]));
EXPECT_EQ(1, lround(derived[6]));
EXPECT_EQ(1, lround(derived[7]));
EXPECT_EQ(0, lround(derived[8]));
EXPECT_EQ(23, lround(derived[9]));
EXPECT_EQ(0, lround(derived[10]));
EXPECT_EQ(3, lround(derived[11]));
EXPECT_EQ(1, lround(derived[12]));
EXPECT_EQ(2, lround(derived[13]));
EXPECT_EQ(7, lround(derived[14]));
}
TEST(DomDistillerPageFeaturesTest, TestPath3) {
GURL url("https://example.com/");
std::vector<double> derived(DeriveFromPath(url));
EXPECT_EQ(0, lround(derived[1]));
EXPECT_EQ(0, lround(derived[2]));
EXPECT_EQ(0, lround(derived[3]));
EXPECT_EQ(0, lround(derived[4]));
EXPECT_EQ(0, lround(derived[5]));
EXPECT_EQ(0, lround(derived[6]));
EXPECT_EQ(0, lround(derived[7]));
EXPECT_EQ(0, lround(derived[8]));
EXPECT_EQ(1, lround(derived[9]));
EXPECT_EQ(1, lround(derived[10]));
EXPECT_EQ(0, lround(derived[11]));
EXPECT_EQ(0, lround(derived[12]));
EXPECT_EQ(0, lround(derived[13]));
EXPECT_EQ(1, lround(derived[14]));
}
TEST(DomDistillerPageFeaturesTest, TestPath4) {
GURL url("https://example.com/trailing/");
std::vector<double> derived(DeriveFromPath(url));
EXPECT_EQ(0, lround(derived[1]));
EXPECT_EQ(0, lround(derived[2]));
EXPECT_EQ(0, lround(derived[3]));
EXPECT_EQ(0, lround(derived[4]));
EXPECT_EQ(0, lround(derived[5]));
EXPECT_EQ(0, lround(derived[6]));
EXPECT_EQ(0, lround(derived[7]));
EXPECT_EQ(0, lround(derived[8]));
EXPECT_EQ(10, lround(derived[9]));
EXPECT_EQ(0, lround(derived[10]));
EXPECT_EQ(1, lround(derived[11]));
EXPECT_EQ(0, lround(derived[12]));
EXPECT_EQ(0, lround(derived[13]));
EXPECT_EQ(9, lround(derived[14]));
}
} // namespace
} // namespace dom_distiller
|
