synapse_structure_weight_state_accumulator_window_impl.h

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/*
 * 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.
 */
 
#ifndef _SYNAPSE_STRUCTURE_WEIGHT_STATE_ACCUMULATOR_WINDOW_H_
#define _SYNAPSE_STRUCTURE_WEIGHT_STATE_ACCUMULATOR_WINDOW_H_
 
typedef struct plastic_synapse_t {
    unsigned int weight : 16;        
    int accumulator : 4;             
    unsigned int state : 2;          
    unsigned int window_length : 10; 
} plastic_synapse_t;
 
typedef struct update_state_t {
    weight_state_t weight_state; 
 
    int32_t accumulator;         
    int32_t state;               
 
    uint32_t window_length;      
} update_state_t;
 
typedef plastic_synapse_t final_state_t;
 
#include "synapse_structure.h"
 
static inline update_state_t synapse_structure_get_update_state(
        plastic_synapse_t synaptic_word, index_t synapse_type) {
    // Create update state, using weight dependance to initialise the weight
    // state and copying other parameters from the synaptic word into 32-bit
    // form
    update_state_t update_state;
    update_state.weight_state =
            weight_get_initial(synaptic_word.weight, synapse_type);
    update_state.accumulator = (int32_t) synaptic_word.accumulator;
    update_state.state = (uint32_t) synaptic_word.state;
    update_state.window_length = (uint32_t) synaptic_word.window_length;
    return update_state;
}
 
//---------------------------------------
static inline final_state_t synapse_structure_get_final_state(
        update_state_t state) {
    // Get weight from state
    weight_t weight = weight_get_final(state.weight_state);
 
    // Build this into synaptic word along with updated accumulator and state
    return (final_state_t) {
        .weight = weight,
        .accumulator = (int) state.accumulator,
        .state = (unsigned int) state.state,
        .window_length = (unsigned int)state.window_length
    };
}
 
//---------------------------------------
static inline weight_t synapse_structure_get_final_weight(
        final_state_t final_state) {
    return final_state.weight;
}
 
//---------------------------------------
static inline plastic_synapse_t synapse_structure_get_final_synaptic_word(
        final_state_t final_state) {
    return final_state;
}
 
//---------------------------------------
static inline plastic_synapse_t synapse_structure_create_synapse(
        weight_t weight) {
    return (plastic_synapse_t) {
        .weight = weight,
        .accumulator = 0,
        .state = 0,
        .window_length = 0
    };
}
 
//---------------------------------------
static inline weight_t synapse_structure_get_weight(
        plastic_synapse_t synaptic_word) {
    return synaptic_word.weight;
}
 
static inline void synapse_structure_decay_weight(
        update_state_t *state, uint32_t decay) {
    weight_decay(&(state->weight_state), decay);
}
 
static inline accum synapse_structure_get_update_weight(update_state_t state) {
    return weight_get_update(state.weight_state);
}
 
#endif // _SYNAPSE_STRUCTURE_WEIGHT_STATE_ACCUMULATOR_WINDOW_H_