Add spellcheck and word suggestion to the prediction service

third_party/android_prediction/suggest/core/layout/proximity_info_params.cpp

Index: third_party/android_prediction/suggest/core/layout/proximity_info_params.cpp
diff --git a/third_party/android_prediction/suggest/core/layout/proximity_info_params.cpp b/third_party/android_prediction/suggest/core/layout/proximity_info_params.cpp
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index 0000000000000000000000000000000000000000..29605f96bbbd5deb4c30d59200430b232b6ac861
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+++ b/third_party/android_prediction/suggest/core/layout/proximity_info_params.cpp
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed 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.
+ */
+
+#include "third_party/android_prediction/defines.h"
+#include "third_party/android_prediction/suggest/core/layout/proximity_info_params.h"
+
+namespace latinime {
+const float ProximityInfoParams::NOT_A_DISTANCE_FLOAT = -1.0f;
+const int ProximityInfoParams::MIN_DOUBLE_LETTER_BEELINE_SPEED_PERCENTILE = 5;
+const float ProximityInfoParams::VERTICAL_SWEET_SPOT_SCALE = 1.0f;
+const float ProximityInfoParams::VERTICAL_SWEET_SPOT_SCALE_G = 0.5f;
+
+/* Per method constants */
+// Used by ProximityInfoStateUtils::updateNearKeysDistances()
+const float ProximityInfoParams::NEAR_KEY_THRESHOLD_FOR_DISTANCE = 2.0f;
+
+// Used by ProximityInfoStateUtils::isPrevLocalMin()
+const float ProximityInfoParams::MARGIN_FOR_PREV_LOCAL_MIN = 0.01f;
+
+// Used by ProximityInfoStateUtils::getPointScore()
+const int ProximityInfoParams::DISTANCE_BASE_SCALE = 100;
+const float ProximityInfoParams::NEAR_KEY_THRESHOLD_FOR_POINT_SCORE = 0.6f;
+const int ProximityInfoParams::CORNER_CHECK_DISTANCE_THRESHOLD_SCALE = 25;
+const float ProximityInfoParams::NOT_LOCALMIN_DISTANCE_SCORE = -1.0f;
+const float ProximityInfoParams::LOCALMIN_DISTANCE_AND_NEAR_TO_KEY_SCORE = 1.0f;
+const float ProximityInfoParams::CORNER_ANGLE_THRESHOLD_FOR_POINT_SCORE = M_PI_F * 2.0f / 3.0f;
+const float ProximityInfoParams::CORNER_SUM_ANGLE_THRESHOLD = M_PI_F / 4.0f;
+const float ProximityInfoParams::CORNER_SCORE = 1.0f;
+
+// Used by ProximityInfoStateUtils::refreshSpeedRates()
+const int ProximityInfoParams::NUM_POINTS_FOR_SPEED_CALCULATION = 2;
+
+// Used by ProximityInfoStateUtils::pushTouchPoint()
+const int ProximityInfoParams::LAST_POINT_SKIP_DISTANCE_SCALE = 4;
+
+// Used by ProximityInfoStateUtils::updateAlignPointProbabilities()
+const float ProximityInfoParams::MIN_PROBABILITY = 0.000005f;
+const float ProximityInfoParams::MAX_SKIP_PROBABILITY = 0.95f;
+const float ProximityInfoParams::SKIP_FIRST_POINT_PROBABILITY = 0.01f;
+const float ProximityInfoParams::SKIP_LAST_POINT_PROBABILITY = 0.1f;
+const float ProximityInfoParams::MIN_SPEED_RATE_FOR_SKIP_PROBABILITY = 0.15f;
+const float ProximityInfoParams::SPEED_WEIGHT_FOR_SKIP_PROBABILITY = 0.9f;
+const float ProximityInfoParams::SLOW_STRAIGHT_WEIGHT_FOR_SKIP_PROBABILITY = 0.6f;
+const float ProximityInfoParams::NEAREST_DISTANCE_WEIGHT = 0.5f;
+const float ProximityInfoParams::NEAREST_DISTANCE_BIAS = 0.5f;
+const float ProximityInfoParams::NEAREST_DISTANCE_WEIGHT_FOR_LAST = 0.6f;
+const float ProximityInfoParams::NEAREST_DISTANCE_BIAS_FOR_LAST = 0.4f;
+const float ProximityInfoParams::ANGLE_WEIGHT = 0.90f;
+const float ProximityInfoParams::DEEP_CORNER_ANGLE_THRESHOLD = M_PI_F * 60.0f / 180.0f;
+const float ProximityInfoParams::SKIP_DEEP_CORNER_PROBABILITY = 0.1f;
+const float ProximityInfoParams::CORNER_ANGLE_THRESHOLD = M_PI_F * 30.0f / 180.0f;
+const float ProximityInfoParams::STRAIGHT_ANGLE_THRESHOLD = M_PI_F * 15.0f / 180.0f;
+const float ProximityInfoParams::SKIP_CORNER_PROBABILITY = 0.4f;
+const float ProximityInfoParams::SPEED_MARGIN = 0.1f;
+const float ProximityInfoParams::CENTER_VALUE_OF_NORMALIZED_DISTRIBUTION = 0.0f;
+// TODO: The variance is critical for accuracy; thus, adjusting these parameters by machine
+// learning or something would be efficient.
+const float ProximityInfoParams::SPEEDxANGLE_WEIGHT_FOR_STANDARD_DEVIATION = 0.3f;
+const float ProximityInfoParams::MAX_SPEEDxANGLE_RATE_FOR_STANDARD_DEVIATION = 0.25f;
+const float ProximityInfoParams::SPEEDxNEAREST_WEIGHT_FOR_STANDARD_DEVIATION = 0.5f;
+const float ProximityInfoParams::MAX_SPEEDxNEAREST_RATE_FOR_STANDARD_DEVIATION = 0.15f;
+const float ProximityInfoParams::MIN_STANDARD_DEVIATION = 0.37f;
+const float ProximityInfoParams::STANDARD_DEVIATION_X_WEIGHT_FOR_FIRST = 1.25f;
+const float ProximityInfoParams::STANDARD_DEVIATION_Y_WEIGHT_FOR_FIRST = 0.85f;
+const float ProximityInfoParams::STANDARD_DEVIATION_X_WEIGHT_FOR_LAST = 1.4f;
+const float ProximityInfoParams::STANDARD_DEVIATION_Y_WEIGHT_FOR_LAST = 0.95f;
+const float ProximityInfoParams::STANDARD_DEVIATION_X_WEIGHT = 1.1f;
+const float ProximityInfoParams::STANDARD_DEVIATION_Y_WEIGHT = 0.95f;
+
+// Used by ProximityInfoStateUtils::suppressCharProbabilities()
+const float ProximityInfoParams::SUPPRESSION_LENGTH_WEIGHT = 1.5f;
+const float ProximityInfoParams::MIN_SUPPRESSION_RATE = 0.1f;
+const float ProximityInfoParams::SUPPRESSION_WEIGHT = 0.5f;
+const float ProximityInfoParams::SUPPRESSION_WEIGHT_FOR_PROBABILITY_GAIN = 0.1f;
+const float ProximityInfoParams::SKIP_PROBABALITY_WEIGHT_FOR_PROBABILITY_GAIN = 0.3f;
+
+// Used by ProximityInfoStateUtils::getMostProbableString()
+const float ProximityInfoParams::DEMOTION_LOG_PROBABILITY = 0.3f;
+
+// Used by ProximityInfoStateUtils::updateSampledSearchKeySets()
+// TODO: Investigate if this is required
+const float ProximityInfoParams::SEARCH_KEY_RADIUS_RATIO = 0.95f;
+
+// Used by ProximityInfoStateUtils::calculateBeelineSpeedRate()
+const int ProximityInfoParams::LOOKUP_RADIUS_PERCENTILE = 50;
+const int ProximityInfoParams::FIRST_POINT_TIME_OFFSET_MILLIS = 150;
+const int ProximityInfoParams::STRONG_DOUBLE_LETTER_TIME_MILLIS = 600;
+
+} // namespace latinime