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Brian 2024-05-17 16:48:31 +10:00
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Tensor-Encoding-Schemes.md

@ -22,10 +22,17 @@ This is not definitive, but is helpful when reading sourcecode or console output
## Tensor Scheme Mapping
| Scheme | `ggml_ftype` C enumeration name | `ggml_type` C enum name | Bits/Weight | Data Type | Block Configuration | Quantized Weight Formula | Initial Commits Or Pull Request Sources (of `ggml_type`) |
| -------- | ------------------------------- | ----------------------- | ----------- | ----------------------------- | ---------------------------------------------------------------------- | ----------------------------------------------- | ------------------------------------------------------------------------ |
| F32 | GGML_FTYPE_ALL_F32 | GGML_TYPE_F32 | 32 | 32-bit IEEE 754 | - | - | [llama.cpp CM: Initial Release](https://github.com/ggerganov/llama.cpp/commit/26c084662903ddaca19bef982831bfb0856e8257) |
| BF16 | GGML_FTYPE_MOSTLY_BF16 | GGML_TYPE_BF16 | 16 | bfloat16 (trunc 32b IEEE754) | - | - | [llama.cpp PR: Introduce bfloat16 support #6412](https://github.com/ggerganov/llama.cpp/pull/6412) |
| F16 | GGML_FTYPE_MOSTLY_F16 | GGML_TYPE_F16 | 16 | 16-bit IEEE 754 | - | - | [llama.cpp CM: Initial Release](https://github.com/ggerganov/llama.cpp/commit/26c084662903ddaca19bef982831bfb0856e8257) |
| F32 | GGML_FTYPE_ALL_F32 | GGML_TYPE_F32 | 32 | 32-bit IEEE 754 | - | - | [llama.cpp CM: Initial Release](https://github.com/ggerganov/llama.cpp/commit/26c084662903ddaca19bef982831bfb0856e8257) |
| F64 | - | GGML_TYPE_F64 | 64 | 64-bit IEEE 754 | - | - | [llama.cpp CM: Add support for I64 and F64 arrays #6062](https://github.com/ggerganov/llama.cpp/pull/6062) |
| I8 | - | GGML_TYPE_I8 | 8 | (signed?) integer | - | - | [llama.cpp PR: Designate enum vals for integer types #6050](https://github.com/ggerganov/llama.cpp/pull/6050) |
| I16 | - | GGML_TYPE_I16 | 16 | (signed?) integer | - | - | [llama.cpp PR: Designate enum vals for integer types #6050](https://github.com/ggerganov/llama.cpp/pull/6050) |
| I32 | - | GGML_TYPE_I32 | 32 | (signed?) integer | - | - | [llama.cpp PR: Designate enum vals for integer types #6050](https://github.com/ggerganov/llama.cpp/pull/6050) |
| I64 | - | GGML_TYPE_I64 | 64 | (signed?) integer | - | - | [llama.cpp PR: Add support for I64 and F64 arrays #6062](https://github.com/ggerganov/llama.cpp/pull/6062) |
| Q4_0 | GGML_FTYPE_MOSTLY_Q4_0 | GGML_TYPE_Q4_0 | 4 | round to nearest quantization | Each block has 32 weights | w = q * block_scale | [llama.cpp CM: Initial Release](https://github.com/ggerganov/llama.cpp/commit/26c084662903ddaca19bef982831bfb0856e8257) |
| Q4_1 | GGML_FTYPE_MOSTLY_Q4_1 | GGML_TYPE_Q4_1 | 4 | round to nearest quantization | Each block has 32 weights | w = q * block_scale + block_minimum | [llama.cpp CM: Initial Release](https://github.com/ggerganov/llama.cpp/commit/26c084662903ddaca19bef982831bfb0856e8257) |
| Q4_1_F16 | GGML_FTYPE_MOSTLY_Q4_1_SOME_F16 | - | 4 | round to nearest quantization | Each block has 32 weights (token embedding and output weights are F16) | w = q * block_scale + block_minimum | [llama.cpp CM](https://github.com/ggerganov/llama.cpp/commit/6bc4400e67e6bc4faad3ad3d5e9d8a6576a9752d) |
@ -39,14 +46,13 @@ This is not definitive, but is helpful when reading sourcecode or console output
| KQ5 | GGML_FTYPE_MOSTLY_Q5_K | GGML_TYPE_Q5_K | 5.5 | k-quantization | Superblocks with 8 blocks, each block has 32 weights | w = q * block_scale (6-bit) + block_min (6-bit) | [llama.cpp PR: k-quants #1684](https://github.com/ggerganov/llama.cpp/pull/1684) |
| KQ6 | GGML_FTYPE_MOSTLY_Q6_K | GGML_TYPE_Q6_K | 6.5625 | k-quantization | Superblocks with 16 blocks, each block has 16 weights | w = q * block_scale (8-bit) | [llama.cpp PR: k-quants #1684](https://github.com/ggerganov/llama.cpp/pull/1684) |
| KQ8 | - | GGML_TYPE_Q8_K | 8.? | k-quantization | ? | w = ? | [llama.cpp PR: k-quants #1684](https://github.com/ggerganov/llama.cpp/pull/1684) |
| IQ1_S | GGML_FTYPE_MOSTLY_IQ1_S | GGML_TYPE_IQ1_S | 1.5 | i-quantization | Superblocks with 8 blocks, each block has 32 weights | w = func(superblock_scale, importance_matrix) | [llama.cpp PR: 1.5 bit quantization #5453](https://github.com/ggerganov/llama.cpp/pull/5453) |
| IQ1_M | GGML_FTYPE_MOSTLY_IQ1_M | GGML_TYPE_IQ1_M | 1.75 | i-quantization | Superblocks with 16 blocks, each block has 16 weights | w = func(superblock_scale, importance_matrix) | [llama.cpp PR: IQ1_M: 1.75 bpw quantization #6302](https://github.com/ggerganov/llama.cpp/pull/6302) |
| IQ2_XXS | GGML_FTYPE_MOSTLY_IQ2_XXS | GGML_TYPE_IQ2_XXS | 2.0625 | i-quantization | Superblocks with 8 blocks, each block has 32 weights | w = func(superblock_scale, importance_matrix) | [llama.cpp PR: SOTA 2-bit quants #4773](https://github.com/ggerganov/llama.cpp/pull/4773) |
| IQ2_XS | GGML_FTYPE_MOSTLY_IQ2_XS | GGML_TYPE_IQ2_XS | 2.31 | i-quantization | Superblocks with 16 blocks, each block has 16 weights | w = func(superblock_scale, importance_matrix) | [llama.cpp PR: SOTA 2-bit quants - part 2 #4856](https://github.com/ggerganov/llama.cpp/pull/4856) |
| IQ3_XXS | GGML_FTYPE_MOSTLY_IQ3_XXS | GGML_TYPE_IQ3_XXS | 3.0625 | i-quantization | Superblocks with 8 blocks, each block has 32 weights | w = func(superblock_scale, importance_matrix) | [llama.cpp PR: SOTA 3-bit quants #5196](https://github.com/ggerganov/llama.cpp/pull/5196) |
| IQ1_S | GGML_FTYPE_MOSTLY_IQ1_S | GGML_TYPE_IQ1_S | 1.5 | i-quantization | Superblocks with 8 blocks, each block has 32 weights | w = func(superblock_scale, importance_matrix) | [llama.cpp PR: 1.5 bit quantization #5453](https://github.com/ggerganov/llama.cpp/pull/5453) |
| IQ4_NL | GGML_FTYPE_MOSTLY_IQ4_NL | GGML_TYPE_IQ4_NL | 4.5 | i-quantization | Superblocks with 16 blocks, each block has 16 weights | w = [non linear mapping of quants to weights] | [llama.cpp PR: IQ4_NL: 4-bit non-linear quants with blocks of 32 #5590](https://github.com/ggerganov/llama.cpp/pull/5590) |
| IQ3_S | GGML_FTYPE_MOSTLY_IQ3_S | GGML_TYPE_IQ3_S | 3.4375 | i-quantization | ? | w = func(superblock_scale, importance_matrix) | [llama.cpp PR: IQ3_S: a much better alternative to Q3_K #5676](https://github.com/ggerganov/llama.cpp/pull/5676) |
| IQ2_S | GGML_FTYPE_MOSTLY_IQ2_S | GGML_TYPE_IQ2_S | 2.5 | i-quantization | ? | w = func(superblock_scale, importance_matrix) | [llama.cpp PR: Adding IQ2_S and IQ2_M to complete coverage of the 2-3 bit quantization range #5721](https://github.com/ggerganov/llama.cpp/pull/5721) |
| IQ3_S | GGML_FTYPE_MOSTLY_IQ3_S | GGML_TYPE_IQ3_S | 3.4375 | i-quantization | ? | w = func(superblock_scale, importance_matrix) | [llama.cpp PR: IQ3_S: a much better alternative to Q3_K #5676](https://github.com/ggerganov/llama.cpp/pull/5676) |
| IQ3_XXS | GGML_FTYPE_MOSTLY_IQ3_XXS | GGML_TYPE_IQ3_XXS | 3.0625 | i-quantization | Superblocks with 8 blocks, each block has 32 weights | w = func(superblock_scale, importance_matrix) | [llama.cpp PR: SOTA 3-bit quants #5196](https://github.com/ggerganov/llama.cpp/pull/5196) |
| IQ4_NL | GGML_FTYPE_MOSTLY_IQ4_NL | GGML_TYPE_IQ4_NL | 4.5 | i-quantization | Superblocks with 16 blocks, each block has 16 weights | w = [non linear mapping of quants to weights] | [llama.cpp PR: IQ4_NL: 4-bit non-linear quants with blocks of 32 #5590](https://github.com/ggerganov/llama.cpp/pull/5590) |
| IQ4_XS | GGML_FTYPE_MOSTLY_IQ4_XS | GGML_TYPE_IQ4_XS | 4.25 | i-quantization | Superblocks with 8 blocks, each block has 32 weights | w = func(superblock_scale, importance_matrix) | [llama.cpp PR: IQ4_XS: a 4.25 bpw quantization #5747](https://github.com/ggerganov/llama.cpp/pull/5747) |
| IQ1_M | GGML_FTYPE_MOSTLY_IQ1_M | GGML_TYPE_IQ1_M | 1.75 | i-quantization | Superblocks with 16 blocks, each block has 16 weights | w = func(superblock_scale, importance_matrix) | [llama.cpp PR: IQ1_M: 1.75 bpw quantization #6302](https://github.com/ggerganov/llama.cpp/pull/6302) |
| BF16 | GGML_FTYPE_MOSTLY_BF16 | GGML_TYPE_BF16 | 16 | bfloat16 (trunc 32b IEEE754) | - | - | [llama.cpp PR: Introduce bfloat16 support #6412](https://github.com/ggerganov/llama.cpp/pull/6412) |