mirror of
https://github.com/microsoft/BitNet.git
synced 2026-08-23 17:36:31 +00:00
Add bitnet-embeddings-0.6b model adaptation with F16 and I2_S GGUF conversion
- Add GGUF conversion tool for bitnet-embeddings-0.6b (safetensors -> F16/I2_S GGUF) - Add Qwen3 architecture support in llama.cpp submodule with per-projection RMSNorm - Add I2_S ternary quantization (2-bit packed -1/0/+1) for lossless precision - Add f16 norm weight support for correct embedding inference - Guard bitnet-lut-kernels.h include with TL1/TL2 preprocessor checks - Update llama.cpp submodule to dev-bitnet-embedding-0.6b branch - Document F16 (from multilingual-e5-0.6b) and I2_S (from bitnet-embeddings-0.6b) conversion process
This commit is contained in:
isHuangXin
@@ -0,0 +1,502 @@
|
||||
#!/usr/bin/env python3
|
||||
|
||||
from __future__ import annotations
|
||||
|
||||
import argparse
|
||||
import json
|
||||
import logging
|
||||
import os
|
||||
import sys
|
||||
from hashlib import sha256
|
||||
from pathlib import Path
|
||||
from typing import Any, Iterator
|
||||
|
||||
import numpy as np
|
||||
import torch
|
||||
|
||||
# Allow using the local gguf-py if present
|
||||
if "NO_LOCAL_GGUF" not in os.environ:
|
||||
_local_gguf = Path(__file__).parent / "gguf-py"
|
||||
if _local_gguf.exists():
|
||||
sys.path.insert(1, str(_local_gguf))
|
||||
import gguf
|
||||
|
||||
logger = logging.getLogger("convert-bitnet-embedding")
|
||||
|
||||
# ---------------------------------------------------------------------------
|
||||
# Tensor name mapping: HuggingFace -> GGUF
|
||||
# ---------------------------------------------------------------------------
|
||||
|
||||
def build_tensor_name_map(n_layers: int) -> dict[str, str]:
|
||||
"""Build HF tensor name -> GGUF tensor name mapping."""
|
||||
mapping: dict[str, str] = {
|
||||
"embed_tokens.weight": "token_embd.weight",
|
||||
"norm.weight": "output_norm.weight",
|
||||
}
|
||||
|
||||
for i in range(n_layers):
|
||||
pfx = f"layers.{i}"
|
||||
blk = f"blk.{i}"
|
||||
|
||||
mapping.update({
|
||||
# Layer norms
|
||||
f"{pfx}.input_layernorm.weight": f"{blk}.attn_norm.weight",
|
||||
f"{pfx}.post_attention_layernorm.weight": f"{blk}.ffn_norm.weight",
|
||||
|
||||
# Self-attention projections
|
||||
f"{pfx}.self_attn.q_proj.weight": f"{blk}.attn_q.weight",
|
||||
f"{pfx}.self_attn.k_proj.weight": f"{blk}.attn_k.weight",
|
||||
f"{pfx}.self_attn.v_proj.weight": f"{blk}.attn_v.weight",
|
||||
f"{pfx}.self_attn.o_proj.weight": f"{blk}.attn_output.weight",
|
||||
|
||||
# QK head norms (standard Qwen3)
|
||||
f"{pfx}.self_attn.q_norm.weight": f"{blk}.attn_q_norm.weight",
|
||||
f"{pfx}.self_attn.k_norm.weight": f"{blk}.attn_k_norm.weight",
|
||||
|
||||
# Per-projection input norms (BitNet-specific)
|
||||
f"{pfx}.self_attn.q_proj.norm.weight": f"{blk}.attn_q_norm_in.weight",
|
||||
f"{pfx}.self_attn.k_proj.norm.weight": f"{blk}.attn_k_norm_in.weight",
|
||||
f"{pfx}.self_attn.v_proj.norm.weight": f"{blk}.attn_v_norm_in.weight",
|
||||
f"{pfx}.self_attn.o_proj.norm.weight": f"{blk}.attn_output_norm_in.weight",
|
||||
|
||||
# MLP projections
|
||||
f"{pfx}.mlp.gate_proj.weight": f"{blk}.ffn_gate.weight",
|
||||
f"{pfx}.mlp.up_proj.weight": f"{blk}.ffn_up.weight",
|
||||
f"{pfx}.mlp.down_proj.weight": f"{blk}.ffn_down.weight",
|
||||
|
||||
# Per-projection input norms for MLP (BitNet-specific)
|
||||
f"{pfx}.mlp.gate_proj.norm.weight": f"{blk}.ffn_gate_norm_in.weight",
|
||||
f"{pfx}.mlp.up_proj.norm.weight": f"{blk}.ffn_up_norm_in.weight",
|
||||
f"{pfx}.mlp.down_proj.norm.weight": f"{blk}.ffn_down_norm_in.weight",
|
||||
})
|
||||
|
||||
return mapping
|
||||
|
||||
|
||||
# ---------------------------------------------------------------------------
|
||||
# Tokenizer handling (GPT-2 / BPE for Qwen3)
|
||||
# ---------------------------------------------------------------------------
|
||||
|
||||
def get_vocab_base_pre(tokenizer) -> str:
|
||||
# encoding this string and hashing the resulting tokens would (hopefully) give us a unique identifier that
|
||||
# is specific for the BPE pre-tokenizer used by the model
|
||||
# we will use this unique identifier to write a "tokenizer.ggml.pre" entry in the GGUF file which we can
|
||||
# use in llama.cpp to implement the same pre-tokenizer
|
||||
|
||||
chktxt = '\n \n\n \n\n\n \t \t\t \t\n \n \n \n \n\U0001f680 (normal) \U0001f636\U0001f32b️ (multiple emojis concatenated) ✅ \U0001f999\U0001f999 3 33 333 3333 33333 333333 3333333 33333333 3.3 3..3 3...3 កាន់តែពិសេសអាច\U0001f601 ?我想在apple工作1314151天～ ------======= нещо на Български \'\'\'\'\'\'```````""""......!!!!!!?????? I\'ve been \'told he\'s there, \'RE you sure? \'M not sure I\'ll make it, \'D you like some tea? We\'Ve a\'lL'
|
||||
|
||||
chktok = tokenizer.encode(chktxt)
|
||||
chkhsh = sha256(str(chktok).encode()).hexdigest()
|
||||
|
||||
logger.debug(f"chktok: {chktok}")
|
||||
logger.debug(f"chkhsh: {chkhsh}")
|
||||
|
||||
res = None
|
||||
|
||||
# NOTE: if you get an error here, you need to update the convert_hf_to_gguf_update.py script
|
||||
# or pull the latest version of the model from Huggingface
|
||||
# don't edit the hashes manually!
|
||||
if chkhsh == "0ef9807a4087ebef797fc749390439009c3b9eda9ad1a097abbe738f486c01e5":
|
||||
# ref: https://huggingface.co/meta-llama/Meta-Llama-3-8B
|
||||
res = "llama-bpe"
|
||||
if chkhsh == "049ecf7629871e3041641907f3de7c733e4dbfdc736f57d882ba0b0845599754":
|
||||
# ref: https://huggingface.co/deepseek-ai/deepseek-llm-7b-base
|
||||
res = "deepseek-llm"
|
||||
if chkhsh == "347715f544604f9118bb75ed199f68779f423cabb20db6de6f31b908d04d7821":
|
||||
# ref: https://huggingface.co/deepseek-ai/deepseek-coder-6.7b-base
|
||||
res = "deepseek-coder"
|
||||
if chkhsh == "8aeee3860c56296a157a1fe2fad249ec40aa59b1bb5709f4ade11c4e6fe652ed":
|
||||
# ref: https://huggingface.co/tiiuae/falcon-7b
|
||||
res = "falcon"
|
||||
if chkhsh == "3ce83efda5659b07b1ad37ca97ca5797ea4285d9b9ab0dc679e4a720c9da7454":
|
||||
# ref: https://huggingface.co/openai-community/gpt2
|
||||
res = "gpt-2"
|
||||
if chkhsh == "d4540891389ea895b53b399da6ac824becc30f2fba0e9ddbb98f92e55ca0e97c":
|
||||
# ref: https://huggingface.co/Qwen/Qwen3-Embedding-0.6B
|
||||
res = "qwen2"
|
||||
|
||||
if res is None:
|
||||
logger.warning("\n")
|
||||
logger.warning("**************************************************************************************")
|
||||
logger.warning("** WARNING: The BPE pre-tokenizer was not recognized!")
|
||||
logger.warning("** There are 2 possible reasons for this:")
|
||||
logger.warning("** - the model has not been added to convert_hf_to_gguf_update.py yet")
|
||||
logger.warning("** - the pre-tokenization config has changed upstream")
|
||||
logger.warning("** Check your model files and convert_hf_to_gguf_update.py and update them accordingly.")
|
||||
logger.warning("** ref: https://github.com/ggml-org/llama.cpp/pull/6920")
|
||||
logger.warning("**")
|
||||
logger.warning(f"** chkhsh: {chkhsh}")
|
||||
logger.warning("**************************************************************************************")
|
||||
logger.warning("\n")
|
||||
raise NotImplementedError("BPE pre-tokenizer was not recognized - update get_vocab_base_pre()")
|
||||
|
||||
logger.debug(f"tokenizer.ggml.pre: {repr(res)}")
|
||||
logger.debug(f"chkhsh: {chkhsh}")
|
||||
|
||||
return res
|
||||
|
||||
|
||||
def _does_token_look_special(token: str) -> bool:
|
||||
"""Check if a token looks like a special token (e.g., <|...|>, <...>)."""
|
||||
if not token:
|
||||
return False
|
||||
# Matches patterns like <|endoftext|>, <s>, </s>, [CLS], [SEP], etc.
|
||||
if token.startswith(("<|", "<", "[")) and token.endswith(("|>", ">", "]")):
|
||||
return True
|
||||
return False
|
||||
|
||||
|
||||
def set_vocab(gguf_writer: gguf.GGUFWriter, dir_model: Path, hparams: dict):
|
||||
"""Set GPT-2 BPE vocab for Qwen3."""
|
||||
from transformers import AutoTokenizer
|
||||
tokenizer = AutoTokenizer.from_pretrained(dir_model)
|
||||
vocab_size = hparams.get("vocab_size", len(tokenizer.vocab))
|
||||
|
||||
tokpre = get_vocab_base_pre(tokenizer)
|
||||
|
||||
tokens: list[str] = []
|
||||
toktypes: list[int] = []
|
||||
|
||||
reverse_vocab = {id_: tok for tok, id_ in tokenizer.vocab.items()}
|
||||
added_vocab = tokenizer.get_added_vocab()
|
||||
|
||||
added_tokens_decoder = tokenizer.added_tokens_decoder
|
||||
|
||||
for i in range(vocab_size):
|
||||
if i not in reverse_vocab:
|
||||
tokens.append(f"[PAD{i}]")
|
||||
toktypes.append(gguf.TokenType.UNUSED)
|
||||
elif reverse_vocab[i] in added_vocab:
|
||||
token = reverse_vocab[i]
|
||||
|
||||
# Only encode-decode non-normalized tokens (matching llama.cpp upstream)
|
||||
if not added_tokens_decoder[i].normalized:
|
||||
token = tokenizer.decode(tokenizer.encode(token, add_special_tokens=False))
|
||||
|
||||
if added_tokens_decoder[i].special or _does_token_look_special(token):
|
||||
toktypes.append(gguf.TokenType.CONTROL)
|
||||
else:
|
||||
# Pre-normalize user-defined spaces (for Gemma-style tokenizers)
|
||||
token = token.replace(b"\xe2\x96\x81".decode("utf-8"), " ")
|
||||
toktypes.append(gguf.TokenType.USER_DEFINED)
|
||||
|
||||
tokens.append(token)
|
||||
else:
|
||||
tokens.append(reverse_vocab[i])
|
||||
toktypes.append(gguf.TokenType.NORMAL)
|
||||
|
||||
gguf_writer.add_tokenizer_model("gpt2")
|
||||
gguf_writer.add_tokenizer_pre(tokpre)
|
||||
gguf_writer.add_token_list(tokens)
|
||||
gguf_writer.add_token_types(toktypes)
|
||||
|
||||
special_vocab = gguf.SpecialVocab(dir_model, load_merges=True)
|
||||
# Override EOS token: PyTorch tokenizer appends <|endoftext|> (151643) as the
|
||||
# sentence-end marker, not <|im_end|> (151645). For last-token pooling to work
|
||||
# correctly, llama.cpp must append the same token.
|
||||
special_vocab.special_token_ids["eos"] = 151643
|
||||
special_vocab.add_to_gguf(gguf_writer)
|
||||
|
||||
# Embedding models need EOS token appended for last-token pooling
|
||||
gguf_writer.add_add_eos_token(True)
|
||||
|
||||
|
||||
# ---------------------------------------------------------------------------
|
||||
# GGUF metadata
|
||||
# ---------------------------------------------------------------------------
|
||||
|
||||
def set_gguf_parameters(gguf_writer: gguf.GGUFWriter, hparams: dict, dir_model: Path, ftype: int):
|
||||
gguf_writer.add_name(dir_model.name)
|
||||
|
||||
n_layers = hparams["num_hidden_layers"]
|
||||
n_embd = hparams["hidden_size"]
|
||||
n_head = hparams["num_attention_heads"]
|
||||
n_head_kv = hparams.get("num_key_value_heads", n_head)
|
||||
n_ff = hparams["intermediate_size"]
|
||||
|
||||
gguf_writer.add_block_count(n_layers)
|
||||
gguf_writer.add_context_length(hparams.get("max_position_embeddings", 32768))
|
||||
gguf_writer.add_embedding_length(n_embd)
|
||||
gguf_writer.add_feed_forward_length(n_ff)
|
||||
gguf_writer.add_head_count(n_head)
|
||||
gguf_writer.add_head_count_kv(n_head_kv)
|
||||
gguf_writer.add_vocab_size(hparams["vocab_size"])
|
||||
|
||||
head_dim = hparams.get("head_dim", n_embd // n_head)
|
||||
gguf_writer.add_rope_dimension_count(head_dim)
|
||||
gguf_writer.add_key_length(head_dim)
|
||||
gguf_writer.add_value_length(head_dim)
|
||||
|
||||
if hparams.get("rope_theta") is not None:
|
||||
gguf_writer.add_rope_freq_base(hparams["rope_theta"])
|
||||
if hparams.get("rms_norm_eps") is not None:
|
||||
gguf_writer.add_layer_norm_rms_eps(hparams["rms_norm_eps"])
|
||||
|
||||
gguf_writer.add_file_type(ftype)
|
||||
|
||||
# Pooling type for embedding models
|
||||
# Try to read from modules.json / 1_Pooling/config.json (sentence-transformers convention)
|
||||
pooling_type = None
|
||||
module_path = dir_model / "modules.json"
|
||||
if module_path.is_file():
|
||||
with open(module_path, encoding="utf-8") as f:
|
||||
modules = json.load(f)
|
||||
for mod in modules:
|
||||
if mod["type"].endswith("Pooling"):
|
||||
pooling_path = dir_model / mod["path"] / "config.json"
|
||||
if pooling_path.is_file():
|
||||
with open(pooling_path, encoding="utf-8") as f:
|
||||
pooling = json.load(f)
|
||||
if pooling.get("pooling_mode_mean_tokens"):
|
||||
pooling_type = gguf.PoolingType.MEAN
|
||||
elif pooling.get("pooling_mode_cls_token"):
|
||||
pooling_type = gguf.PoolingType.CLS
|
||||
elif pooling.get("pooling_mode_lasttoken"):
|
||||
pooling_type = gguf.PoolingType.LAST
|
||||
break
|
||||
if pooling_type is None:
|
||||
# Default to MEAN pooling for embedding models
|
||||
logger.info(" No pooling config found, defaulting to MEAN pooling")
|
||||
pooling_type = gguf.PoolingType.MEAN
|
||||
gguf_writer.add_pooling_type(pooling_type)
|
||||
|
||||
logger.info(f" n_layers={n_layers}, n_embd={n_embd}, n_head={n_head}, n_head_kv={n_head_kv}, n_ff={n_ff}")
|
||||
|
||||
|
||||
# ---------------------------------------------------------------------------
|
||||
# Tensor iteration from safetensors
|
||||
# ---------------------------------------------------------------------------
|
||||
|
||||
def iter_tensors(dir_model: Path) -> Iterator[tuple[str, torch.Tensor]]:
|
||||
"""Yield (name, tensor) from safetensors files."""
|
||||
from safetensors import safe_open
|
||||
|
||||
safetensor_files = sorted(dir_model.glob("*.safetensors"))
|
||||
if not safetensor_files:
|
||||
raise FileNotFoundError(f"No .safetensors files in {dir_model}")
|
||||
|
||||
for sf_path in safetensor_files:
|
||||
logger.info(f"Loading {sf_path.name}")
|
||||
with safe_open(str(sf_path), framework="pt", device="cpu") as f:
|
||||
for name in f.keys():
|
||||
yield name, f.get_tensor(name)
|
||||
|
||||
|
||||
# ---------------------------------------------------------------------------
|
||||
# I2_S ternary packing (platform-independent)
|
||||
# ---------------------------------------------------------------------------
|
||||
#
|
||||
# I2_S format (from dequantize_row_i2_s in ggml-quants.c):
|
||||
# - Every 128 values form a block, packed into 32 bytes
|
||||
# - Each byte stores 4 values at positions [0*32+gp, 1*32+gp, 2*32+gp, 3*32+gp]
|
||||
# where gp is the byte index within the 32-byte group
|
||||
# - Encoding per byte: c0=(b>>6)&3, c1=(b>>4)&3, c2=(b>>2)&3, c3=(b>>0)&3
|
||||
# - Value mapping: 0 -> -1, 1 -> 0, 2 -> +1, 3 -> 0
|
||||
# - Scale is stored as a separate tensor (tensor_name + "_scale")
|
||||
|
||||
def quantize_to_i2_s(w: np.ndarray) -> np.ndarray:
|
||||
"""Quantize float weights to ternary and pack into I2_S layout.
|
||||
|
||||
Uses the same quantization as BitLinear weight_quant_minmax():
|
||||
scale = 1.0 / mean(|w|)
|
||||
q = round(w * scale).clamp(-1, 1)
|
||||
dequant = q / scale = q * mean(|w|)
|
||||
|
||||
The I2_S format is self-contained: packed ternary bytes followed by a f32 scale
|
||||
appended at the end of the data buffer.
|
||||
|
||||
Args:
|
||||
w: float weight tensor of shape (M, K)
|
||||
|
||||
Returns:
|
||||
packed_data: uint8 array containing I2_S packed bytes + scale (as 4 trailing bytes)
|
||||
"""
|
||||
M, K = w.shape
|
||||
n = M * K
|
||||
w_flat = w.flatten().astype(np.float32)
|
||||
|
||||
# BitLinear weight_quant_minmax: scale = 1/mean(|w|), then round & clamp
|
||||
abs_mean = np.mean(np.abs(w_flat))
|
||||
abs_mean = max(abs_mean, 1e-5)
|
||||
inv_scale = 1.0 / abs_mean
|
||||
q_float = np.round(w_flat * inv_scale).clip(-1, 1) # ternary: {-1, 0, 1}
|
||||
|
||||
# scale for dequantization = abs_mean (i.e., dequant = q * abs_mean)
|
||||
scale = np.float32(abs_mean)
|
||||
|
||||
# Map ternary {-1, 0, 1} -> I2_S encoding {0, 1, 2}
|
||||
# -1 -> 0, 0 -> 1, +1 -> 2
|
||||
q = np.ones(n, dtype=np.uint8) # default to 1 (zero)
|
||||
q[q_float > 0.5] = 2 # +1 -> 2
|
||||
q[q_float < -0.5] = 0 # -1 -> 0
|
||||
|
||||
# Pack into I2_S layout: 128-value blocks, interleaved into 32 bytes
|
||||
# Pad to multiple of 128
|
||||
pad_len = (128 - n % 128) % 128
|
||||
if pad_len:
|
||||
q = np.pad(q, (0, pad_len), constant_values=1)
|
||||
|
||||
n_padded = len(q)
|
||||
n_blocks = n_padded // 128
|
||||
|
||||
q = q.reshape(n_blocks, 4, 32)
|
||||
|
||||
# Pack: byte = (c0 << 6) | (c1 << 4) | (c2 << 2) | c3
|
||||
packed = (q[:, 0, :].astype(np.uint8) << 6) | \
|
||||
(q[:, 1, :].astype(np.uint8) << 4) | \
|
||||
(q[:, 2, :].astype(np.uint8) << 2) | \
|
||||
(q[:, 3, :].astype(np.uint8))
|
||||
|
||||
packed = packed.reshape(-1).astype(np.uint8)
|
||||
|
||||
# I2_S format: packed_bytes + 32-byte aligned tail (scale in first 4 bytes of tail)
|
||||
# Total size = n_elements / 4 + 32 (as defined in ggml.c)
|
||||
packed_size = n // 4
|
||||
total_size = packed_size + 32
|
||||
result = np.zeros(total_size, dtype=np.uint8)
|
||||
result[:len(packed)] = packed[:packed_size]
|
||||
# Write scale as float32 at offset packed_size
|
||||
result[packed_size:packed_size+4] = np.frombuffer(scale.tobytes(), dtype=np.uint8)
|
||||
|
||||
return result
|
||||
|
||||
|
||||
# ---------------------------------------------------------------------------
|
||||
# Main conversion
|
||||
# ---------------------------------------------------------------------------
|
||||
|
||||
def main():
|
||||
parser = argparse.ArgumentParser(description="Convert bitnet-embeddings to GGUF")
|
||||
parser.add_argument("model", type=Path, help="Model directory")
|
||||
parser.add_argument("--outfile", type=Path, default=None, help="Output GGUF file")
|
||||
parser.add_argument("--outtype", choices=["f32", "f16", "i2_s"], default="f16",
|
||||
help="Output type: f32, f16, or i2_s (ternary quantized)")
|
||||
parser.add_argument("--verbose", action="store_true")
|
||||
args = parser.parse_args()
|
||||
|
||||
logging.basicConfig(level=logging.DEBUG if args.verbose else logging.INFO)
|
||||
|
||||
dir_model = args.model
|
||||
if not dir_model.is_dir():
|
||||
logger.error(f"{dir_model} is not a directory")
|
||||
sys.exit(1)
|
||||
|
||||
# Default output filename
|
||||
if args.outfile is None:
|
||||
suffix = {"f32": "-f32", "f16": "-f16", "i2_s": "-f16-new-i2_s"}[args.outtype]
|
||||
args.outfile = dir_model / f"{dir_model.name}{suffix}.gguf"
|
||||
|
||||
# Load config
|
||||
with open(dir_model / "config.json") as f:
|
||||
hparams = json.load(f)
|
||||
|
||||
arch = hparams.get("model_type", "qwen3")
|
||||
assert arch == "qwen3", f"Expected qwen3 architecture, got {arch}"
|
||||
|
||||
n_layers = hparams["num_hidden_layers"]
|
||||
|
||||
# Determine ftype
|
||||
if args.outtype == "f32":
|
||||
ftype = 0 # GGML F32
|
||||
elif args.outtype == "f16":
|
||||
ftype = 1 # GGML F16
|
||||
else: # i2_s
|
||||
ftype = 40 # LLAMA_FTYPE_MOSTLY_I2_S
|
||||
|
||||
logger.info(f"Converting {dir_model.name} to GGUF ({args.outtype})")
|
||||
|
||||
# Create GGUF writer
|
||||
gguf_writer = gguf.GGUFWriter(str(args.outfile), "qwen3")
|
||||
|
||||
# Set parameters
|
||||
set_gguf_parameters(gguf_writer, hparams, dir_model, ftype)
|
||||
|
||||
# Set vocab
|
||||
logger.info("Setting tokenizer/vocab...")
|
||||
set_vocab(gguf_writer, dir_model, hparams)
|
||||
|
||||
# Build tensor name map
|
||||
tensor_map = build_tensor_name_map(n_layers)
|
||||
|
||||
# Process tensors
|
||||
logger.info("Processing tensors...")
|
||||
tensor_count = 0
|
||||
for hf_name, data_torch in iter_tensors(dir_model):
|
||||
# Skip tensors we don't need
|
||||
if hf_name.endswith((".attention.masked_bias", ".attention.bias", ".rotary_emb.inv_freq")):
|
||||
continue
|
||||
|
||||
# Strip "model." prefix if present
|
||||
name = hf_name
|
||||
if name.startswith("model."):
|
||||
name = name[len("model."):]
|
||||
|
||||
# Look up GGUF name
|
||||
gguf_name = tensor_map.get(name)
|
||||
if gguf_name is None:
|
||||
logger.warning(f"Skipping unmapped tensor: {hf_name}")
|
||||
continue
|
||||
|
||||
old_dtype = data_torch.dtype
|
||||
|
||||
# Convert bf16 -> f32 first (bf16 not directly supported by gguf)
|
||||
if data_torch.dtype == torch.bfloat16:
|
||||
data_torch = data_torch.to(torch.float32)
|
||||
|
||||
data = data_torch.squeeze().numpy()
|
||||
n_dims = len(data.shape)
|
||||
data_shape = data.shape
|
||||
|
||||
# Determine if this is a linear weight suitable for ternary quantization
|
||||
is_norm = gguf_name.endswith("_norm.weight") or gguf_name.endswith("_norm_in.weight")
|
||||
is_embed = gguf_name == "token_embd.weight"
|
||||
is_linear_weight = n_dims == 2 and not is_norm and not is_embed
|
||||
suit_i2 = is_linear_weight
|
||||
|
||||
if args.outtype == "i2_s" and suit_i2:
|
||||
# --- I2_S ternary packing (scale embedded in data) ---
|
||||
packed = quantize_to_i2_s(data)
|
||||
data_qtype = gguf.GGMLQuantizationType.I2_S
|
||||
|
||||
shape_str = f"{{{', '.join(str(n) for n in reversed(data_shape))}}}"
|
||||
logger.info(f" {gguf_name}: {list(data_shape)} {old_dtype} -> I2_S, shape = {shape_str}")
|
||||
|
||||
gguf_writer.add_tensor(gguf_name, packed, raw_shape=data_shape, raw_dtype=data_qtype)
|
||||
tensor_count += 1
|
||||
|
||||
elif args.outtype in ("f16", "i2_s") and (is_linear_weight or is_embed):
|
||||
# 2D weight tensors (linear + embedding) -> f16
|
||||
data = data.astype(np.float16)
|
||||
logger.info(f" {gguf_name}: {list(data_torch.shape)} {old_dtype} -> float16")
|
||||
gguf_writer.add_tensor(gguf_name, data)
|
||||
tensor_count += 1
|
||||
|
||||
else:
|
||||
# norms, 1D tensors
|
||||
if args.outtype in ("f16", "i2_s"):
|
||||
data = data.astype(np.float16)
|
||||
logger.info(f" {gguf_name}: {list(data_torch.shape)} {old_dtype} -> float16")
|
||||
else:
|
||||
if data.dtype != np.float32:
|
||||
data = data.astype(np.float32)
|
||||
logger.info(f" {gguf_name}: {list(data_torch.shape)} {old_dtype} -> float32")
|
||||
gguf_writer.add_tensor(gguf_name, data)
|
||||
tensor_count += 1
|
||||
|
||||
logger.info(f"Total tensors written: {tensor_count}")
|
||||
|
||||
# Note: output.weight (lm_head) is skipped for embedding models —
|
||||
# it is not needed (no token generation) and saves ~297MB for this model.
|
||||
|
||||
# Write GGUF
|
||||
logger.info(f"Writing to {args.outfile}...")
|
||||
gguf_writer.write_header_to_file()
|
||||
gguf_writer.write_kv_data_to_file()
|
||||
gguf_writer.write_tensors_to_file()
|
||||
gguf_writer.close()
|
||||
|
||||
logger.info("Done!")
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
Reference in New Issue
Block a user