ggml : fix I8MM Q4_1 scaling factor conversion#10562
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ggerganov
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Nov 28, 2024
ggml/src/ggml-cpu/ggml-cpu-quants.c
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This fixes a bug where the y->d was not converted to F32, resulting in completely wrong numbers when going through this CPU branch.
slaren
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Nov 28, 2024
ggml/src/ggml-cpu/ggml-cpu-quants.c
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We need to remove the ARM runtime feature detection completely, it doesn't work at all and never will. So I would prefer if at least we don't make that task worse by adding more checks like this.
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Ok, I will change the PR to just include the F16 -> F32 fix in the Q4_1 kernel.
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slaren
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Nov 29, 2024
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target #10561
These changes fixillegal instructioncrash on M1 Pro which does not do a runtime check for the availability of I8MM. We now checkggml_cpu_has_matmul_int8()and if it is false, we unpack the 2x2 multiplication into 4 dot products.This fix aside, I am wondering if we should drop the
int nrcsupport in theggml_vec_dotkernels to keep it simple and proceed to implement proper GEMMs similar to the work inggml-cpu-aarch64.c?