cutlass/test/unit/epilogue/thread/linear_combination.cu

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/*! \file
    \brief Unit tests for thread-level GEMM
*/

#include "../../common/cutlass_unit_test.h"

#include "cutlass/epilogue/thread/linear_combination.h"
#include "cutlass/epilogue/thread/linear_combination_gelu.h"
#include "cutlass/epilogue/thread/activation.h"

/////////////////////////////////////////////////////////////////////////////////////////////////

TEST(Epilogue_thread_linear_combination, device_side_f16_f32_value) {

  using Element = float;
  using ElementOutput = cutlass::half_t;
  int const kCount = 8;

  using LinearCombination = cutlass::epilogue::thread::LinearCombination<
    ElementOutput, 
    kCount,
    Element, 
    Element>;

  Element alpha = Element(2);
  Element beta = Element(1);

  typename LinearCombination::Params params(alpha, beta);

  LinearCombination linear_combination_op(params);

  cutlass::Array<ElementOutput, kCount> source;
  cutlass::Array<Element, kCount> accum;

  for (int i = 0; i < kCount; ++i) {
    accum[i] = Element(i * 2);
    source[i] = ElementOutput((i * 7 % 9) - 4);
  }

  cutlass::Array<ElementOutput, kCount> destination = linear_combination_op(accum, source);

  for (int i = 0; i < kCount; ++i) {
    
    ElementOutput expected = ElementOutput(
      alpha * accum[i] + 
      beta * Element(ElementOutput(source[i]))
    );

    ElementOutput got = destination[i];
    
    EXPECT_TRUE(expected == got);
  }
}

/////////////////////////////////////////////////////////////////////////////////////////////////

TEST(Epilogue_thread_linear_combination, device_side_f16_f32_ptr) {

  using Element = float;
  using ElementOutput = cutlass::half_t;
  int const kCount = 8;

  using LinearCombination = cutlass::epilogue::thread::LinearCombination<
    ElementOutput, 
    kCount,
    Element, 
    Element>;

  Element alpha = Element(2);
  Element beta = Element(1);

  typename LinearCombination::Params params(&alpha, &beta);

  LinearCombination linear_combination_op(params);

  cutlass::Array<ElementOutput, kCount> source;
  cutlass::Array<Element, kCount> accum;

  for (int i = 0; i < kCount; ++i) {
    accum[i] = Element(i * 2);
    source[i] = ElementOutput((i * 7 % 9) - 4);
  }

  cutlass::Array<ElementOutput, kCount> destination = linear_combination_op(accum, source);

  for (int i = 0; i < kCount; ++i) {
    
    ElementOutput expected = ElementOutput(
      alpha * accum[i] + 
      beta * Element(ElementOutput(source[i]))
    );

    ElementOutput got = destination[i];
    
    EXPECT_TRUE(expected == got);
  }
}

/////////////////////////////////////////////////////////////////////////////////////////////////

TEST(Epilogue_thread_linear_combination_gelu, device_side_f16_f16_ptr) {

  using Element = cutlass::half_t;
  using ElementOutput = cutlass::half_t;
  int const kCount = 8;

  using LinearCombination = cutlass::epilogue::thread::LinearCombinationGELU<
    ElementOutput,
    kCount,
    Element,
    Element>;

  Element alpha = Element(1);
  Element beta = Element(0);

  typename LinearCombination::Params params(&alpha, &beta);

  LinearCombination linear_combination_op(params);

  cutlass::Array<ElementOutput, kCount> source;
  cutlass::Array<Element, kCount> accum;

  for (int i = 0; i < kCount; ++i) {
    accum[i] = Element((float)i * 0.3f);
    source[i] = ElementOutput(0);
  }

  cutlass::Array<ElementOutput, kCount> destination = linear_combination_op(accum, source);

  const float sqrt2 = sqrtf(2.0f);
  for (int i = 0; i < kCount; ++i) {
    float scalar = (float)accum[i];
    ElementOutput expected = ElementOutput(
      0.5f * scalar * (1.0f + erff(scalar / sqrt2))
    );

    ElementOutput got = destination[i];
    ElementOutput diff(fabs((float)(expected - got)));
    EXPECT_TRUE(diff <= std::numeric_limits<cutlass::half_t>::epsilon());
  }
}

/////////////////////////////////////////////////////////////////////////////////////////////////