public void LLM_TransformIDCT_CompareToAccurate(int seed)
{
float[] sourceArray = Create8x8RoundedRandomFloatData(MinAllowedValue, MaxAllowedValue, seed);
var srcBlock = Block8x8F.Load(sourceArray);
// reference
Block8x8F expected = ReferenceImplementations.AccurateDCT.TransformIDCT(ref srcBlock);
// testee
// Part of the IDCT calculations is fused into the quantization step
// We must multiply input block with adjusted no-quantization matrix
// before applying IDCT
// Dequantization using unit matrix - no values are upscaled
Block8x8F dequantMatrix = CreateBlockFromScalar(1);
// This step is needed to apply adjusting multipliers to the input block
FastFloatingPointDCT.AdjustToIDCT(ref dequantMatrix);
// IDCT implementation tranforms blocks after transposition
srcBlock.TransposeInplace();
srcBlock.MultiplyInPlace(ref dequantMatrix);
// IDCT calculation
FastFloatingPointDCT.TransformIDCT(ref srcBlock);
this.CompareBlocks(expected, srcBlock, 1f);
}
static void RunTest(string serialized)
{
int seed = FeatureTestRunner.Deserialize <int>(serialized);
Span <float> src = Create8x8RoundedRandomFloatData(MinAllowedValue, MaxAllowedValue, seed);
var srcBlock = default(Block8x8F);
srcBlock.LoadFrom(src);
float[] expectedDest = new float[64];
float[] temp = new float[64];
// reference
ReferenceImplementations.LLM_FloatingPoint_DCT.IDCT2D_llm(src, expectedDest, temp);
// testee
// Part of the IDCT calculations is fused into the quantization step
// We must multiply input block with adjusted no-quantization matrix
// before applying IDCT
Block8x8F dequantMatrix = CreateBlockFromScalar(1);
// Dequantization using unit matrix - no values are upscaled
// as quant matrix is all 1's
// This step is needed to apply adjusting multipliers to the input block
FastFloatingPointDCT.AdjustToIDCT(ref dequantMatrix);
srcBlock.MultiplyInPlace(ref dequantMatrix);
// IDCT implementation tranforms blocks after transposition
srcBlock.TransposeInplace();
// IDCT calculation
FastFloatingPointDCT.TransformIDCT(ref srcBlock);
float[] actualDest = srcBlock.ToArray();
Assert.Equal(actualDest, expectedDest, new ApproximateFloatComparer(1f));
}
