mirror of
https://github.com/nomic-ai/gpt4all.git
synced 2024-10-01 01:06:10 -04:00
139 lines
3.9 KiB
Python
139 lines
3.9 KiB
Python
from __future__ import annotations
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import json
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import os
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import struct
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import sys
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from pathlib import Path
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import gguf
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import numpy as np
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from transformers import AutoModel, AutoTokenizer
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if not 2 <= len(sys.argv) < 4:
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print("Usage: {} dir-model [ftype]\n".format(os.path.basename(__file__)))
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print(" ftype == 0 -> float32")
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print(" ftype == 1 -> float16")
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sys.exit(1)
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# output in the same directory as the model
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dir_model = Path(sys.argv[1])
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with open(dir_model / "vocab.txt", encoding="utf-8") as f:
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vocab = f.readlines()
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# possible data types
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# ftype == 0 -> float32
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# ftype == 1 -> float16
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#
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# map from ftype to string
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ftype_str = ["f32", "f16"]
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ftype = 1
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if len(sys.argv) > 2:
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ftype = int(sys.argv[2])
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if ftype < 0 or ftype > 1:
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print("Invalid ftype: " + str(ftype))
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sys.exit(1)
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fname_out = dir_model / ("ggml-model-" + ftype_str[ftype] + ".gguf")
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ARCH = gguf.MODEL_ARCH.BERT
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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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model = AutoModel.from_pretrained(dir_model, low_cpu_mem_usage=True)
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hparams = model.config
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print(model)
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block_count = hparams.num_hidden_layers
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gguf_writer.add_name("BERT")
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gguf_writer.add_context_length(hparams.max_position_embeddings)
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gguf_writer.add_embedding_length(hparams.hidden_size)
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gguf_writer.add_feed_forward_length(hparams.intermediate_size)
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gguf_writer.add_block_count(block_count)
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gguf_writer.add_head_count(hparams.num_attention_heads)
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gguf_writer.add_file_type(ftype)
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print("gguf: get tokenizer metadata")
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try:
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with open(dir_model / "tokenizer.json", encoding="utf-8") as f:
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tokenizer_json = json.load(f)
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except FileNotFoundError as e:
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print(f'Error: Missing {e.filename!r}', file=sys.stderr)
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sys.exit(1)
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print("gguf: get wordpiece tokenizer vocab")
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tokenizer = AutoTokenizer.from_pretrained(dir_model)
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print(tokenizer.encode('I believe the meaning of life is'))
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tokens: list[bytearray] = []
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reverse_vocab = {id: encoded_tok for encoded_tok, id in tokenizer.vocab.items()}
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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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for i in range(hparams.vocab_size):
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try:
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text = reverse_vocab[i]
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except KeyError:
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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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gguf_writer.add_tokenizer_model("bert") # wordpiece
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gguf_writer.add_token_list(tokens)
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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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print("gguf: get tensor metadata")
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tensor_map = gguf.get_tensor_name_map(ARCH, block_count)
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list_vars = model.state_dict()
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for name in list_vars.keys():
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print(name, list_vars[name].shape, list_vars[name].dtype)
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for name in list_vars.keys():
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data = list_vars[name].squeeze().numpy()
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if name in ['embeddings.position_ids', 'pooler.dense.weight', 'pooler.dense.bias']:
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continue
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print("Processing variable:", name, "with shape:", data.shape)
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n_dims = len(data.shape)
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# ftype == 0 -> float32, ftype == 1 -> float16
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if ftype == 1 and name[-7:] == ".weight" and n_dims == 2:
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print(" Converting to float16")
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data = data.astype(np.float16)
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l_type = 1
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else:
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l_type = 0
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# map tensor names
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new_name = tensor_map.get_name(name, try_suffixes=(".weight", ".bias"))
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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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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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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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