f8c90cdbaa
* add refact model * resolve comments * rebase to the latest * solve alibi cpu error --------- Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
319 lines
9.6 KiB
Python
Executable file
319 lines
9.6 KiB
Python
Executable file
#!/usr/bin/env python3
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# HF refact--> gguf conversion
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from __future__ import annotations
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import argparse
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import json
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import os
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import sys
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from pathlib import Path
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import numpy as np
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import torch
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from transformers import AutoTokenizer # type: ignore[import]
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if "NO_LOCAL_GGUF" not in os.environ:
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sys.path.insert(1, str(Path(__file__).parent / "gguf-py" / "gguf"))
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import gguf
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def bytes_to_unicode():
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# ref: https://github.com/openai/gpt-2/blob/master/src/encoder.py
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"""
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Returns list of utf-8 byte and a corresponding list of unicode strings.
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The reversible bpe codes work on unicode strings.
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This means you need a large # of unicode characters in your vocab if you want to avoid UNKs.
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When you're at something like a 10B token dataset you end up needing around 5K for decent coverage.
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This is a significant percentage of your normal, say, 32K bpe vocab.
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To avoid that, we want lookup tables between utf-8 bytes and unicode strings.
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And avoids mapping to whitespace/control characters the bpe code barfs on.
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"""
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bs = (
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list(range(ord("!"), ord("~") + 1))
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+ list(range(ord("¡"), ord("¬") + 1))
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+ list(range(ord("®"), ord("ÿ") + 1))
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)
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cs = bs[:]
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n = 0
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for b in range(2**8):
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if b not in bs:
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bs.append(b)
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cs.append(2**8 + n)
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n += 1
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return dict(zip(bs, (chr(n) for n in cs)))
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def count_model_parts(dir_model: Path) -> int:
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num_parts = 0
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for filename in os.listdir(dir_model):
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if filename.startswith("pytorch_model-"):
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num_parts += 1
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if num_parts > 0:
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print("gguf: found " + str(num_parts) + " model parts")
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return num_parts
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def parse_args() -> argparse.Namespace:
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parser = argparse.ArgumentParser(
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description="Convert a Refact model to a GGML compatible file"
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)
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parser.add_argument(
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"--vocab-only",
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action="store_true",
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help="extract only the vocab",
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)
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parser.add_argument(
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"--outfile",
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type=Path,
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help="path to write to; default: based on input",
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)
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parser.add_argument(
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"model",
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type=Path,
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help="directory containing model file, or model file itself (*.bin)",
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)
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parser.add_argument(
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"ftype",
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type=int,
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choices=[0, 1],
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default=1,
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nargs="?",
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help="output format - use 0 for float32, 1 for float16",
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)
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return parser.parse_args()
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args = parse_args()
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dir_model = args.model
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ftype = args.ftype
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if not dir_model.is_dir():
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print(f"Error: {args.model} is not a directory", file=sys.stderr)
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sys.exit(1)
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# possible tensor data types
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# ftype == 0 -> float32
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# ftype == 1 -> float16
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# map from ftype to string
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ftype_str = ["f32", "f16"]
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if args.outfile is not None:
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fname_out = args.outfile
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else:
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# output in the same directory as the model by default
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fname_out = dir_model / f"ggml-model-{ftype_str[ftype]}.gguf"
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print("gguf: loading model " + dir_model.name)
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with open(dir_model / "config.json", "r", encoding="utf-8") as f:
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hparams = json.load(f)
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if hparams["architectures"][0] != "GPTRefactForCausalLM":
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print("Model architecture not supported: " + hparams["architectures"][0])
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sys.exit(1)
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# get number of model parts
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num_parts = count_model_parts(dir_model)
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ARCH = gguf.MODEL_ARCH.REFACT
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gguf_writer = gguf.GGUFWriter(fname_out, gguf.MODEL_ARCH_NAMES[ARCH])
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print("gguf: get model metadata")
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# Get refact feed forward dimension
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hidden_dim = hparams["n_embd"]
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inner_dim = 4 * hidden_dim
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hidden_dim = int(2 * inner_dim / 3)
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multiple_of = 256
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ff_dim = multiple_of * ((hidden_dim + multiple_of - 1) // multiple_of)
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block_count = hparams["n_layer"]
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gguf_writer.add_name("Refact")
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# refact uses Alibi. So this is from config.json which might be used by training.
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gguf_writer.add_context_length(hparams["n_positions"])
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gguf_writer.add_embedding_length(hparams["n_embd"])
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gguf_writer.add_feed_forward_length(ff_dim)
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gguf_writer.add_block_count(block_count)
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gguf_writer.add_head_count(hparams["n_head"])
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gguf_writer.add_head_count_kv(1)
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gguf_writer.add_layer_norm_rms_eps(hparams["layer_norm_epsilon"])
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gguf_writer.add_file_type(ftype)
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# TOKENIZATION
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print("gguf: get tokenizer metadata")
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tokens: list[bytearray] = []
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scores: list[float] = []
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toktypes: list[int] = []
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tokenizer_json_file = dir_model / "tokenizer.json"
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if not tokenizer_json_file.is_file():
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print(f"Error: Missing {tokenizer_json_file}", file=sys.stderr)
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sys.exit(1)
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# gpt2 tokenizer
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gguf_writer.add_tokenizer_model("gpt2")
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with open(tokenizer_json_file, "r", encoding="utf-8") as f:
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tokenizer_json = json.load(f)
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print("gguf: get gpt2 tokenizer vocab")
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# The number of tokens in tokenizer.json can differ from the expected vocab size.
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# This causes downstream issues with mismatched tensor sizes when running the inference
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vocab_size = (
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hparams["vocab_size"]
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if "vocab_size" in hparams
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else len(tokenizer_json["model"]["vocab"])
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)
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tokenizer = AutoTokenizer.from_pretrained(dir_model, trust_remote_code=True)
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reverse_vocab = {id: encoded_tok for encoded_tok, id in tokenizer.vocab.items()}
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byte_encoder = bytes_to_unicode()
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byte_decoder = {v: k for k, v in byte_encoder.items()}
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for i in range(vocab_size):
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if i in reverse_vocab:
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text = reverse_vocab[i]
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try:
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text = bytearray([byte_decoder[c] for c in reverse_vocab[i]])
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except KeyError:
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text = bytearray()
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for c in reverse_vocab[i]:
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if ord(c) < 256: # single byte character
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text.append(byte_decoder[ord(c)])
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else: # multibyte special token character
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text.extend(c.encode("utf-8"))
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else:
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print(f"Key {i} not in tokenizer vocabulary. Padding with an arbitrary token.")
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pad_token = f"[PAD{i}]".encode("utf8")
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text = bytearray(pad_token)
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tokens.append(text)
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scores.append(0.0) # dymmy
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toktypes.append(gguf.TokenType.NORMAL) # dummy
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gguf_writer.add_token_list(tokens)
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gguf_writer.add_token_scores(scores)
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gguf_writer.add_token_types(toktypes)
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special_vocab = gguf.SpecialVocab(dir_model, load_merges=True)
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special_vocab.add_to_gguf(gguf_writer)
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# TENSORS
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tensor_map = gguf.get_tensor_name_map(ARCH, block_count)
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# params for qkv transform
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n_head = hparams["n_head"]
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n_head_kv = 1
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head_dim = hparams["n_embd"] // n_head
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# tensor info
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print("gguf: get tensor metadata")
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if num_parts == 0:
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part_names = iter(("pytorch_model.bin",))
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else:
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part_names = (
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f"pytorch_model-{n:05}-of-{num_parts:05}.bin" for n in range(1, num_parts + 1)
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)
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for part_name in part_names:
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if args.vocab_only:
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break
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print("gguf: loading model part '" + part_name + "'")
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model_part = torch.load(dir_model / part_name, map_location="cpu")
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for i in range(block_count):
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if f"transformer.h.{i}.attn.kv.weight" in model_part:
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data = model_part[f"transformer.h.{i}.attn.kv.weight"]
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model_part[f"model.layers.{i}.self_attn.k_proj.weight"] = data[
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: n_head_kv * head_dim
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]
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model_part[f"model.layers.{i}.self_attn.v_proj.weight"] = data[
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n_head_kv * head_dim :
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]
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del model_part[f"transformer.h.{i}.attn.kv.weight"]
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if f"transformer.h.{i}.attn.q.weight" in model_part:
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model_part[f"model.layers.{i}.self_attn.q_proj.weight"] = model_part[
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f"transformer.h.{i}.attn.q.weight"
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]
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del model_part[f"transformer.h.{i}.attn.q.weight"]
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if f"transformer.h.{i}.mlp.gate_up_proj.weight" in model_part:
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data = model_part[f"transformer.h.{i}.mlp.gate_up_proj.weight"]
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model_part[f"model.layers.{i}.mlp.gate_proj.weight"] = data[:ff_dim]
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model_part[f"model.layers.{i}.mlp.up_proj.weight"] = data[ff_dim:]
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del model_part[f"transformer.h.{i}.mlp.gate_up_proj.weight"]
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for name in model_part.keys():
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data = model_part[name]
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old_dtype = data.dtype
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# convert any unsupported data types to float32
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if data.dtype != torch.float16 and data.dtype != torch.float32:
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data = data.to(torch.float32)
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data = data.squeeze().numpy()
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# map tensor names
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new_name = tensor_map.get_name(name, try_suffixes=(".weight",))
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if new_name is None:
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print("Can not map tensor '" + name + "'")
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sys.exit()
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n_dims = len(data.shape)
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data_dtype = data.dtype
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# if f32 desired, convert any float16 to float32
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if ftype == 0 and data_dtype == np.float16:
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data = data.astype(np.float32)
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# TODO: Why cant we use these float16 as-is? There should be not reason to store float16 as float32
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if ftype == 1 and data_dtype == np.float16 and n_dims == 1:
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data = data.astype(np.float32)
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# if f16 desired, convert any float32 2-dim weight tensors to float16
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if (
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ftype == 1
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and data_dtype == np.float32
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and name.endswith(".weight")
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and n_dims == 2
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):
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data = data.astype(np.float16)
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print(
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new_name
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+ ", n_dims = "
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+ str(n_dims)
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+ ", "
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+ str(old_dtype)
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+ " --> "
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+ str(data.dtype)
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)
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gguf_writer.add_tensor(new_name, data)
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print("gguf: write header")
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gguf_writer.write_header_to_file()
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print("gguf: write metadata")
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gguf_writer.write_kv_data_to_file()
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if not args.vocab_only:
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print("gguf: write tensors")
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gguf_writer.write_tensors_to_file()
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gguf_writer.close()
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print(f"gguf: model successfully exported to '{fname_out}'")
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print("")
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