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Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_cosine_distance_f16.c

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+
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_cosine_distance_f16.c
+ * Description:  Cosine distance between two vectors
+ *
+ * $Date:        23 April 2021
+ * $Revision:    V1.9.0
+ *
+ * Target Processor: Cortex-M and Cortex-A cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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
+ *
+ * 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 "dsp/distance_functions_f16.h"
+
+#if defined(ARM_FLOAT16_SUPPORTED)
+
+#include <limits.h>
+#include <math.h>
+
+/**
+  @ingroup FloatDist
+ */
+
+/**
+  @defgroup CosineDist Cosine distance
+
+  Cosine distance
+ */
+
+
+/**
+  @addtogroup CosineDist
+  @{
+ */
+
+
+
+/**
+ * @brief        Cosine distance between two vectors
+ *
+ * @param[in]    pA         First vector
+ * @param[in]    pB         Second vector
+ * @param[in]    blockSize  vector length
+ * @return distance
+ *
+ * @par           Description
+ *                  cosine_distance(u,v) is 1 - u . v / (Norm(u) Norm(v))
+ */
+
+float16_t arm_cosine_distance_f16(const float16_t *pA,const float16_t *pB, uint32_t blockSize)
+{
+    float16_t pwra,pwrb,dot,tmp;
+
+    arm_power_f16(pA, blockSize, &pwra);
+    arm_power_f16(pB, blockSize, &pwrb);
+
+    arm_dot_prod_f16(pA,pB,blockSize,&dot);
+
+    arm_sqrt_f16((_Float16)pwra * (_Float16)pwrb, &tmp);
+    return(1.0f16 - (_Float16)dot / (_Float16)tmp);
+
+}
+
+
+
+/**
+ * @} end of CosineDist group
+ */
+
+#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */ 
+