param_generator_exponential.h

Go to the documentation of this file.

/*
 * Copyright (c) 2017 The University of Manchester
 *
 * 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
 *
 *     https://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 <stdfix.h>
#include <spin1_api.h>
#include <stdfix-full-iso.h>
#include <random.h>
#include <synapse_expander/rng.h>
#include <synapse_expander/generator_types.h>
 
typedef struct param_generator_exponential_params {
    accum beta;
} param_generator_exponential_params;
 
struct param_generator_exponential {
    param_generator_exponential_params params;
};
 
static void *param_generator_exponential_initialize(void **region) {
    // Allocate memory for the data
    struct param_generator_exponential *params =
            spin1_malloc(sizeof(struct param_generator_exponential));
 
    // Copy the parameters in
    param_generator_exponential_params *params_sdram = *region;
    params->params = *params_sdram;
    *region = &params_sdram[1];
    log_debug("exponential beta = %k", params->params.beta);
 
    return params;
}
 
static void param_generator_exponential_free(void *generator) {
    sark_free(generator);
}
 
static accum param_generator_exponential_generate(void *generator) {
    // generate an exponentially distributed value
    struct param_generator_exponential *params = generator;
    return rng_exponential(core_rng) * params->params.beta;
}