pseudocode/operators/tables/SIGMOID.tosac


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//
// This confidential and proprietary software may be used only as
// authorised by a licensing agreement from ARM Limited
// (C) COPYRIGHT 2020-2024 ARM Limited
// ALL RIGHTS RESERVED
// The entire notice above must be reproduced on all authorised
// copies and copies may only be made to the extent permitted
// by a licensing agreement from ARM Limited.

int16_t sigmoid_reference(int16_t x) { // input x range is -256 to + 256 inclusive
    fp64_t v = static_cast<fp64_t>(x) / static_cast<fp64_t>(16);
    v = 1.0/(1.0 + exp(-v));
    return round_to_nearest_int(32768.0 * v);
}

generate_lookup_table(&sigmoid_table, &sigmoid_reference);