Separate NormalDistribution from ProximityInfoUtils. (3bf9647a) · Commits · e / os / android_packages_inputmethods_LatinIME

native/jni/src/suggest/core/layout/normal_distribution.h

0 → 100644

+49 −0

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		/*
		* Copyright (C) 2014 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.
		*/

		#ifndef LATINIME_NORMAL_DISTRIBUTION_H
		#define LATINIME_NORMAL_DISTRIBUTION_H

		#include <cmath>

		#include "defines.h"

		namespace latinime {

		// Normal distribution N(u, sigma^2).
		class NormalDistribution {
		public:
		NormalDistribution(const float u, const float sigma)
		: mU(u),
		mPreComputedNonExpPart(1.0f / sqrtf(2.0f * M_PI_F
		* GeometryUtils::SQUARE_FLOAT(sigma))),
		mPreComputedExponentPart(-1.0f / (2.0f * GeometryUtils::SQUARE_FLOAT(sigma))) {}

		float getProbabilityDensity(const float x) const {
		const float shiftedX = x - mU;
		return mPreComputedNonExpPart
		* expf(mPreComputedExponentPart * GeometryUtils::SQUARE_FLOAT(shiftedX));
		}

		private:
		DISALLOW_IMPLICIT_CONSTRUCTORS(NormalDistribution);

		const float mU; // mean value
		const float mPreComputedNonExpPart; // = 1 / sqrt(2 * PI * sigma^2)
		const float mPreComputedExponentPart; // = -1 / (2 * sigma^2)
		};
		} // namespace latinime
		#endif // LATINIME_NORMAL_DISTRIBUTION_H

native/jni/src/suggest/core/layout/proximity_info_state_utils.cpp

+3 −2

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		@@ -24,6 +24,7 @@

		#include "defines.h"
		#include "suggest/core/layout/geometry_utils.h"
		#include "suggest/core/layout/normal_distribution.h"
		#include "suggest/core/layout/proximity_info.h"
		#include "suggest/core/layout/proximity_info_params.h"

		@@ -717,8 +718,8 @@ namespace latinime {
		const float sigma = speedxAngleRate + speedxNearestKeyDistanceRate
		+ ProximityInfoParams::MIN_STANDARD_DEVIATION;

		ProximityInfoUtils::NormalDistribution
		distribution(ProximityInfoParams::CENTER_VALUE_OF_NORMALIZED_DISTRIBUTION, sigma);
		NormalDistribution distribution(
		ProximityInfoParams::CENTER_VALUE_OF_NORMALIZED_DISTRIBUTION, sigma);
		// Summing up probability densities of all near keys.
		float sumOfProbabilityDensities = 0.0f;
		for (int j = 0; j < keyCount; ++j) {

native/jni/src/suggest/core/layout/proximity_info_utils.h

+0 −22

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		@@ -125,28 +125,6 @@ class ProximityInfoUtils {
		return type == MATCH_CHAR \|\| type == PROXIMITY_CHAR \|\| type == ADDITIONAL_PROXIMITY_CHAR;
		}

		// Normal distribution N(u, sigma^2).
		struct NormalDistribution {
		public:
		NormalDistribution(const float u, const float sigma)
		: mU(u),
		mPreComputedNonExpPart(1.0f / sqrtf(2.0f * M_PI_F
		* GeometryUtils::SQUARE_FLOAT(sigma))),
		mPreComputedExponentPart(-1.0f / (2.0f * GeometryUtils::SQUARE_FLOAT(sigma))) {}

		float getProbabilityDensity(const float x) const {
		const float shiftedX = x - mU;
		return mPreComputedNonExpPart
		* expf(mPreComputedExponentPart * GeometryUtils::SQUARE_FLOAT(shiftedX));
		}

		private:
		DISALLOW_IMPLICIT_CONSTRUCTORS(NormalDistribution);
		const float mU; // mean value
		const float mPreComputedNonExpPart; // = 1 / sqrt(2 * PI * sigma^2)
		const float mPreComputedExponentPart; // = -1 / (2 * sigma^2)
		}; // struct NormalDistribution

		private:
		DISALLOW_IMPLICIT_CONSTRUCTORS(ProximityInfoUtils);