// Hard Tanh
//
// hard_tanh - Hard Tanh activation
//
// y[t] = clamp( x[t], -1, 1 )
//
// X_n - 1
// Y_n - 1
// C_n - 0


#include <math.h>
#include "ts.h"



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


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

int ts_hard_tanh(
	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_tanh_p );
	(void)c;
	for( uint_t i = 0; i < n; ++i )
	{
		fp_t xi = x[0][i];
		if ( xi < -1 )
			y[0][i] = -1;
		else if ( xi > 1 )
			y[0][i] = 1;
		else
			y[0][i] = xi;
	}
	return 0;
}