lib/hard_sigmoid.c


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// Hard Sigmoid
//
// hard_sigmoid - Hard Sigmoid activation
//
// y[t] = x[t] <= -3 ? 0 : x[t] >= 3 ? 1 : x[t]/6 + 0.5
//
// X_n - 1
// Y_n - 1
// C_n - 0


#include "ts.h"


ts_parameter_t const ts_hard_sigmoid_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 0, .params_size = 0 };


uint_t ts_hard_sigmoid_offset( ts_constant_t const *c )
{
	( void )c;
	return ( 0 );
}

int ts_hard_sigmoid(
	fp_t * const *y, uint_t y_n,
	fp_t const * const *x, uint_t x_n,
	uint_t n, ts_constant_t const *c
)
{
	TS_PROLOGUE( ts_hard_sigmoid_p );
	(void)c;
	for( uint_t i = 0; i < n; ++i )
	{
		fp_t xi = x[0][i];
		if ( xi <= -3 )
			y[0][i] = 0;
		else if ( xi >= 3 )
			y[0][i] = 1;
		else
			y[0][i] = xi / 6 + 0.5;
	}
	return 0;
}