vbatts/llama.cpp
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

convert : refactor vocab selection logic

Browse source 
Fixes #5973
Fixes #6216
This commit is contained in:
Jared Van Bortel 2024-03-27 15:43:16 -04:00
parent 2e6fd63b29
commit 79852ab884
1 changed files with 89 additions and 78 deletions
Download patch file Download diff file Expand all files Collapse all files

157
convert.py
View file

@ -44,6 +44,9 @@ ARCH = gguf.MODEL_ARCH.LLAMA
DEFAULT_CONCURRENCY = 8
ADDED_TOKENS_FILE = 'added_tokens.json'
FAST_TOKENIZER_FILE = 'tokenizer.json'
#
# data types
#
@ -367,32 +370,42 @@ class BpeVocab(Vocab):
tokenizer_model = "gpt2"
name = "bpe"
def __init__(self, fname_tokenizer: Path, fname_added_tokens: Path | None):
with open(fname_tokenizer, encoding="utf-8") as f:
bpe_tokenizer = json.load(f)
def __init__(self, base_path: Path):
added_tokens: dict[str, int] = {}
if isinstance(bpe_tokenizer.get('model'), dict):
self.vocab = bpe_tokenizer["model"]["vocab"]
else:
self.vocab = bpe_tokenizer
added_tokens: dict[str, int]
if fname_added_tokens is not None:
if (fname_tokenizer := base_path / 'vocab.json').exists():
# "slow" tokenizer
with open(fname_tokenizer, encoding="utf-8") as f:
self.vocab = json.load(f)
try:
# FIXME: Verify that added tokens here _cannot_ overlap with the main vocab.
with open(fname_added_tokens, encoding="utf-8") as f:
with open(base_path / ADDED_TOKENS_FILE, encoding="utf-8") as f:
added_tokens = json.load(f)
except FileNotFoundError:
pass
else:
# Fall back to trying to find the added tokens in tokenizer.json
tokenizer_json_file = fname_tokenizer.parent / 'tokenizer.json'
if not tokenizer_json_file.is_file():
added_tokens = {}
else:
with open(tokenizer_json_file, encoding="utf-8") as f:
# "fast" tokenizer
fname_tokenizer = base_path / FAST_TOKENIZER_FILE
# if this fails, FileNotFoundError propagates to caller
with open(fname_tokenizer, encoding="utf-8") as f:
tokenizer_json = json.load(f)
added_tokens = dict(
(item['content'], item['id'])
for item in tokenizer_json.get('added_tokens', [])
tokenizer_model: dict[str, Any] = tokenizer_json['model']
if (
tokenizer_model['type'] != 'BPE' or tokenizer_model.get('byte_fallback', False)
or tokenizer_json['decoder']['type'] != 'ByteLevel'
):
raise FileNotFoundError('Cannot find GPT-2 BPE tokenizer')
self.vocab = tokenizer_model["vocab"]
if (added := tokenizer_json.get('added_tokens')) is not None:
# Added tokens here can be duplicates of the main vocabulary.
if item['content'] not in self.vocab)
added_tokens = {item['content']: item['id']
for item in added
if item['content'] not in self.vocab}
vocab_size = len(self.vocab)
expected_ids = list(range(vocab_size, vocab_size + len(added_tokens)))
@ -432,15 +445,20 @@ class SentencePieceVocab(Vocab):
tokenizer_model = "llama"
name = "spm"
def __init__(self, fname_tokenizer: Path, fname_added_tokens: Path | None):
self.sentencepiece_tokenizer = SentencePieceProcessor(str(fname_tokenizer))
added_tokens: dict[str, int]
if fname_added_tokens is not None:
with open(fname_added_tokens, encoding="utf-8") as f:
def __init__(self, base_path: Path):
added_tokens: dict[str, int] = {}
if (fname_tokenizer := base_path / 'tokenizer.model').exists():
# normal location
try:
with open(base_path / ADDED_TOKENS_FILE, encoding="utf-8") as f:
added_tokens = json.load(f)
else:
added_tokens = {}
except FileNotFoundError:
pass
elif not (fname_tokenizer := base_path.parent / 'tokenizer.model').exists():
# not found in alternate location either
raise FileNotFoundError('Cannot find tokenizer.model')
self.sentencepiece_tokenizer = SentencePieceProcessor(str(fname_tokenizer))
vocab_size = self.sentencepiece_tokenizer.vocab_size()
new_tokens = {id: piece for piece, id in added_tokens.items() if id >= vocab_size}
@ -494,27 +512,40 @@ class SentencePieceVocab(Vocab):
return f"<SentencePieceVocab with {self.vocab_size_base} base tokens and {len(self.added_tokens_list)} added tokens>"
class HfVocab(Vocab):
class LlamaHfVocab(Vocab):
tokenizer_model = "llama"
name = "hfft"
def __init__(self, fname_tokenizer: Path, fname_added_tokens: Path | None = None):
def __init__(self, base_path: Path):
fname_tokenizer = base_path / FAST_TOKENIZER_FILE
# if this fails, FileNotFoundError propagates to caller
with open(fname_tokenizer, encoding='utf-8') as f:
tokenizer_json = json.load(f)
# pre-check so we know if we need transformers
tokenizer_model: dict[str, Any] = tokenizer_json['model']
if (
tokenizer_model['type'] != 'BPE' or not tokenizer_model.get('byte_fallback', False)
or tokenizer_json['decoder']['type'] != 'Sequence'
):
raise FileNotFoundError('Cannot find Llama BPE tokenizer')
try:
from transformers import AutoTokenizer
except ImportError as e:
raise ImportError(
"To use HfVocab, please install the `transformers` package. "
"To use LlamaHfVocab, please install the `transformers` package. "
"You can install it with `pip install transformers`."
) from e
print("fname_tokenizer:", fname_tokenizer)
# Allow the tokenizer to default to slow or fast versions.
# Explicitly set tokenizer to use local paths.
self.tokenizer = AutoTokenizer.from_pretrained(
fname_tokenizer,
cache_dir=fname_tokenizer,
base_path,
cache_dir=base_path,
local_files_only=True,
)
assert self.tokenizer.is_fast # assume tokenizer.json is used
# Initialize lists and dictionaries for added tokens
self.added_tokens_list = []
@ -594,7 +625,7 @@ class HfVocab(Vocab):
yield from self.added_tokens()
def __repr__(self) -> str:
return f"<HfVocab with {self.vocab_size_base} base tokens and {len(self.added_tokens_list)} added tokens>"
return f"<LlamaHfVocab with {self.vocab_size_base} base tokens and {len(self.added_tokens_list)} added tokens>"
#
@ -1315,32 +1346,10 @@ def load_some_model(path: Path) -> ModelPlus:
class VocabFactory:
_FILES = {"spm": "tokenizer.model", "bpe": "vocab.json", "hfft": "tokenizer.json"}
_VOCAB_CLASSES: list[type[Vocab]] = [SentencePieceVocab, BpeVocab, LlamaHfVocab]
def __init__(self, path: Path):
self.path = path
self.file_paths = self._detect_files()
print(f"Found vocab files: {self.file_paths}")
def _detect_files(self) -> dict[str, Path | None]:
def locate(file: str) -> Path | None:
if (path := self.path / file).exists():
return path
if (path := self.path.parent / file).exists():
return path
return None
return {vt: locate(f) for vt, f in self._FILES.items()}
def _select_file(self, vocab_types: list[str]) -> tuple[str, Path]:
for vtype in vocab_types:
try:
path = self.file_paths[vtype]
except KeyError:
raise ValueError(f"Unsupported vocabulary type {vtype}") from None
if path is not None:
return vtype, path
raise FileNotFoundError(f"Could not find any of {[self._FILES[vt] for vt in vocab_types]}")
def _create_special_vocab(self, vocab: BaseVocab, model_parent_path: Path) -> gguf.SpecialVocab:
load_merges = vocab.name == "bpe"
@ -1353,23 +1362,25 @@ class VocabFactory:
)
def _create_vocab_by_path(self, vocab_types: list[str]) -> Vocab:
vocab_type, path = self._select_file(vocab_types)
print(f"Loading vocab file {path!r}, type {vocab_type!r}")
vocab_classes: dict[str, type[Vocab]] = {cls.name: cls for cls in self._VOCAB_CLASSES}
selected_vocabs: dict[str, type[Vocab]] = {}
for vtype in vocab_types:
try:
selected_vocabs[vtype] = vocab_classes[vtype]
except KeyError:
raise ValueError(f"Unsupported vocabulary type {vtype}") from None
added_tokens_path = path.parent / "added_tokens.json"
if vocab_type == "bpe":
return BpeVocab(
path, added_tokens_path if added_tokens_path.exists() else None
)
if vocab_type == "spm":
return SentencePieceVocab(
path, added_tokens_path if added_tokens_path.exists() else None
)
if vocab_type == "hfft":
return HfVocab(
path.parent, added_tokens_path if added_tokens_path.exists() else None
)
raise ValueError(vocab_type)
for vtype, cls in selected_vocabs.items():
try:
vocab = cls(self.path)
break
except FileNotFoundError:
pass # ignore unavailable tokenizers
else:
raise FileNotFoundError(f"Could not find a tokenizer matching any of {vocab_types}")
print(f"Loaded vocab file {vocab.fname_tokenizer!r}, type {vocab.name!r}")
return vocab
def load_vocab(self, vocab_types: list[str] | None, model_parent_path: Path) -> tuple[BaseVocab, gguf.SpecialVocab]:
vocab: BaseVocab