weight.h File Reference

interface for different weight implementations for the weight half of a STDP rule. More...

#include <common/neuron-typedefs.h>
#include <neuron/synapse_row.h>

Go to the source code of this file.

Functions
address_t	weight_initialise (address_t address, uint32_t n_synapse_types, uint32_t *ring_buffer_to_input_buffer_left_shifts)
	Initialises the weight aspect of an STDP rule.
static weight_state_t	weight_get_initial (weight_t weight, index_t synapse_type)
	Gets the initial weight state.
static weight_t	weight_get_final (weight_state_t new_state)
	Gets the final weight.
static void	weight_decay (weight_state_t *state, int32_t decay)
	Decay the weight inside the state by multiplication.
static accum	weight_get_update (weight_state_t state)
	Get the weight inside during update in STDP fixed point format.

Detailed Description

interface for different weight implementations for the weight half of a STDP rule.

the API interface contains:

• weight_initialise(): Initialises the weight aspect of a STDP rule.
• weight_get_initial(): Converts the stored weight into an update-able form.
• weight_get_final(): Converts the updated weight into store-able form.

Definition in file weight.h.

Function Documentation

weight_initialise()

address_t weight_initialise	(	address_t	address,
		uint32_t	n_synapse_types,
		uint32_t *	ring_buffer_to_input_buffer_left_shifts
	)

Initialises the weight aspect of an STDP rule.

Parameters

[in]	address	the absolute address in SRAM where the weight parameters are stored.
[in]	n_synapse_types	The number of synapse types
[in]	ring_buffer_to_input_buffer_left_shifts	how much a value needs to be shifted in the left direction to support comprises with fixed point arithmetic

Returns

the end of the weight region as an absolute SDRAM memory address.

Definition at line 42 of file weight_additive_one_term_impl.c.

weight_get_initial()

static weight_state_t weight_get_initial ( weight_t  weight, index_t  synapse_type  )

static

Gets the initial weight state.

Parameters

[in]	weight	The weight at the start
[in]	synapse_type	The type of synapse involved

Returns

The initial weight state.

weight_get_final()

static weight_t weight_get_final ( weight_state_t  new_state )

static

Gets the final weight.

Parameters

[in]

new_state

The updated weight state

Returns

The new weight.

weight_decay()

static void weight_decay ( weight_state_t *  state, int32_t  decay  )

static

Decay the weight inside the state by multiplication.

Parameters

[in]	state	The state containing the current weight
[in]	decay	The "decay" to multiply the weight by, in STDP fixed point format

weight_get_update()

static accum weight_get_update ( weight_state_t  state )

static

Get the weight inside during update in STDP fixed point format.

Parameters

[in]

state

The state containing the current weight

Returns

The weight in s1615 format