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# Convert a GPTQ quantized LLaMA model to a ggml compatible file
# Based on: https://github.com/qwopqwop200/GPTQ-for-LLaMa
#
import os
import re
import sys
import json
import struct
import numpy as np
import torch
from sentencepiece import SentencePieceProcessor
if len(sys.argv) != 4:
print("Usage: convert-gptq-to-ggml.py llamaXXb-4bit.pt tokenizer.model out.bin\n")
sys.exit(1)
fname_model = sys.argv[1]
fname_tokenizer = sys.argv[2]
dir_out = sys.argv[3]
model = torch.load(fname_model, map_location="cpu")
n_vocab, n_embd = model['model.embed_tokens.weight'].shape
n_layer = 1 + max(int(m.group(1)) for name in model
if (m := re.match(r'model\.layers\.([0-9]+)', name)))
# hardcoded:
n_mult = 256
n_head = {32: 32, 40: 40, 60: 52, 80: 64}[n_layer]
tokenizer = SentencePieceProcessor(fname_tokenizer)
assert tokenizer.vocab_size() == n_vocab
fname_out = sys.argv[3]
fout = open(fname_out, "wb")
fout.write(struct.pack("i", 0x67676d66)) # magic: ggmf in hex
fout.write(struct.pack("i", 1)) # file version
fout.write(struct.pack("i", n_vocab))
fout.write(struct.pack("i", n_embd))
fout.write(struct.pack("i", n_mult))
fout.write(struct.pack("i", n_head))
fout.write(struct.pack("i", n_layer))
fout.write(struct.pack("i", n_embd // n_head)) # rot (obsolete)
fout.write(struct.pack("i", 4))
# This loop unchanged from convert-pth-to-ggml.py:
for i in range(tokenizer.vocab_size()):
if tokenizer.is_unknown(i):
text = " \u2047 ".encode("utf-8")
elif tokenizer.is_control(i):
text = b""
elif tokenizer.is_byte(i):
piece = tokenizer.id_to_piece(i)
if len(piece) != 6:
print(f"Invalid token: {piece}")
sys.exit(1)
byte_value = int(piece[3:-1], 16)
text = struct.pack("B", byte_value)
else:
text = tokenizer.id_to_piece(i).replace("\u2581", " ").encode("utf-8")
fout.write(struct.pack("i", len(text)))
fout.write(text)
fout.write(struct.pack("f", tokenizer.get_score(i)))
def write_header(shape, dst_name, ftype_cur):
sname = dst_name.encode('utf-8')
fout.write(struct.pack("iii", len(shape), len(sname), ftype_cur))
fout.write(struct.pack("i" * len(shape), *shape[::-1]))
fout.write(sname)
# ensure tensor data is aligned
tensor_data_offset = fout.tell()
tensor_data_offset = (tensor_data_offset + 31) & -32
fout.seek(tensor_data_offset)
def convert_non_q4(src_name, dst_name):
v = model[src_name]
shape = v.shape
print("Processing non-Q4 variable: " + src_name + " with shape: ", shape, " and type: ", v.dtype)
if len(shape) == 1:
print(" Converting to float32")
v = v.to(torch.float32)
ftype_cur = {torch.float16: 1, torch.float32: 0}[v.dtype]
# header
write_header(shape, dst_name, ftype_cur)
# data
v.numpy().tofile(fout)
def convert_q4(src_name, dst_name, permute=False):
zeros = model[f"{src_name}.zeros"].numpy()
scales = model[f"{src_name}.scales"].numpy()
bias = model[f"{src_name}.bias"].numpy()
qweight = model[f"{src_name}.qweight"].numpy().T # transpose
# Q4_1 does not support bias; good thing the bias is always all zeros.
assert not np.any(bias)
# Each int32 item is actually 8 int4 items packed together, and it's transposed.
shape = (qweight.shape[0], qweight.shape[1] * 8)
print("Processing Q4 variable: " + src_name + " with shape: ", shape)
# The output format has the int4 weights in groups of 32 rather than 8.
# It looks like this:
# For each row:
# For each group of 32 columns:
# - addend (float32, 4 bytes)
# - scale (float32, 4 bytes)
# - weights (int4 * 32, 16 bytes)
# Note that in the input, the scales and addends are shared between all
# the columns in a row, so we end up wasting quite a bit of memory with
# repeated scales and addends.
addends = -zeros # flip sign
# Since the output format is mixed between integers and floats, we have
# to hackily view the floats as int32s just so numpy will let us
# concatenate them.
addends_view = addends.view(dtype=np.int32)
scales_view = scales.view(dtype=np.int32)
# Split into groups of 4 columns (i.e. 32 columns of quantized data):
grouped = qweight.reshape([qweight.shape[0], qweight.shape[1] // 4, 4])
# Repeat addends and scales:
addends_rep = np.atleast_3d(addends_view).repeat(grouped.shape[1], axis=1)
scales_rep = np.atleast_3d(scales_view).repeat(grouped.shape[1], axis=1)
blob = np.concatenate([scales_rep, addends_rep, grouped], axis=2, casting='no')
if permute:
# Permute some rows to undo the permutation done by convert_llama_weights_to_hf.py.
# This can be done after the above conversion because it doesn't affect column order/layout.
blob = (blob.reshape(n_head, 2, shape[0] // n_head // 2, *blob.shape[1:])
.swapaxes(1, 2)
.reshape(blob.shape))
# header
write_header(shape, dst_name, 3) # ftype = Q4_1
# data
blob.tofile(fout)
convert_non_q4("model.embed_tokens.weight", "tok_embeddings.weight")
convert_non_q4("model.norm.weight", "norm.weight")
convert_non_q4("lm_head.weight", "output.weight")
for i in range(n_layer):
convert_q4(f"model.layers.{i}.self_attn.q_proj", f"layers.{i}.attention.wq.weight", permute=True)
convert_q4(f"model.layers.{i}.self_attn.k_proj", f"layers.{i}.attention.wk.weight", permute=True)
convert_q4(f"model.layers.{i}.self_attn.v_proj", f"layers.{i}.attention.wv.weight")
convert_q4(f"model.layers.{i}.self_attn.o_proj", f"layers.{i}.attention.wo.weight")
convert_q4(f"model.layers.{i}.mlp.gate_proj", f"layers.{i}.feed_forward.w1.weight")
convert_q4(f"model.layers.{i}.mlp.down_proj", f"layers.{i}.feed_forward.w2.weight")
convert_q4(f"model.layers.{i}.mlp.up_proj", f"layers.{i}.feed_forward.w3.weight")
convert_non_q4(f"model.layers.{i}.input_layernorm.weight", f"layers.{i}.attention_norm.weight")
convert_non_q4(f"model.layers.{i}.post_attention_layernorm.weight", f"layers.{i}.ffn_norm.weight")
fout.close()
print("Done. Output file: " + fname_out)
print("")
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