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https://github.com/ggml-org/llama.cpp.git
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436e561931
* Be more strict about converting float to double * Test equivalence of round, SILU implementations Test module is commented out in CMakeLists.txt because the tests may take a long time, depending on how much the compiler optimizes. * Fix softmax in perplexity.cpp * all : prefer float over double where appropriate * perplexity : add <cmath> --------- Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
// These tests may take a long time!
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// They are to prove that conversion from double to float of various functions in ggml.c doesn't affect the result.
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// This is done by checking all finite (non-NaN, non-infinite) floats.
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#undef NDEBUG
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#include <assert.h>
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#include <immintrin.h>
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#include <math.h>
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#include <stdint.h>
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wdouble-promotion"
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// ggml.c::quantize_row_q4_0_reference
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inline static uint8_t round_orig(float v0) { return ((int8_t) (round(v0))) + 8; }
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// ggml.c::ggml_silu_f32
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inline static float silu_orig(float x) {
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return x/(1.0 + exp(-x));
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}
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#pragma GCC diagnostic pop
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// ggml.c::quantize_row_q4_0_reference
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inline static uint8_t round_float(float v0) { return (int8_t)roundf(v0) + 8; }
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// ggml.c::ggml_silu_f32
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inline static float silu_float(float x) {
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return x/(1.0f + expf(-x));
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}
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int main(void) {
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uint32_t x = UINT32_MAX;
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do {
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float f = *(float *)&x;
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assert(!isfinite(f) || (round_orig(f) == round_float(f)));
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} while (x--);
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#ifdef __F16C__
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// GELU and SILU implementations are used with a FP16 lookup table.
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// The original and float-only results are not equal for all inputs after converting to FP16.
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// GELU is an approximation anyway (tanh), not tested here.
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// For SILU, verify that the results are at least the closest floating point numbers, if the FP16 values don't match.
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for (x = 0; x <= UINT16_MAX; x++) {
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float f = _cvtsh_ss(x);
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const float so = silu_orig(f);
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const float sf = silu_float(f);
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assert( (_cvtss_sh(so, 0) == _cvtss_sh(sf, 0))
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|| (nextafterf(so, sf) == sf)
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|| (nextafterf(sf, so) == so));
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}
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#endif
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}
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