Duplicate from spuun/lama

.gitattributes

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+*.7z filter=lfs diff=lfs merge=lfs -text
+*.arrow filter=lfs diff=lfs merge=lfs -text
+*.bin filter=lfs diff=lfs merge=lfs -text
+*.bz2 filter=lfs diff=lfs merge=lfs -text
+*.ckpt filter=lfs diff=lfs merge=lfs -text
+*.ftz filter=lfs diff=lfs merge=lfs -text
+*.gz filter=lfs diff=lfs merge=lfs -text
+*.h5 filter=lfs diff=lfs merge=lfs -text
+*.joblib filter=lfs diff=lfs merge=lfs -text
+*.lfs.* filter=lfs diff=lfs merge=lfs -text
+*.mlmodel filter=lfs diff=lfs merge=lfs -text
+*.model filter=lfs diff=lfs merge=lfs -text
+*.msgpack filter=lfs diff=lfs merge=lfs -text
+*.npy filter=lfs diff=lfs merge=lfs -text
+*.npz filter=lfs diff=lfs merge=lfs -text
+*.onnx filter=lfs diff=lfs merge=lfs -text
+*.ot filter=lfs diff=lfs merge=lfs -text
+*.parquet filter=lfs diff=lfs merge=lfs -text
+*.pb filter=lfs diff=lfs merge=lfs -text
+*.pickle filter=lfs diff=lfs merge=lfs -text
+*.pkl filter=lfs diff=lfs merge=lfs -text
+*.pt filter=lfs diff=lfs merge=lfs -text
+*.pth filter=lfs diff=lfs merge=lfs -text
+*.rar filter=lfs diff=lfs merge=lfs -text
+*.safetensors filter=lfs diff=lfs merge=lfs -text
+saved_model/**/* filter=lfs diff=lfs merge=lfs -text
+*.tar.* filter=lfs diff=lfs merge=lfs -text
+*.tflite filter=lfs diff=lfs merge=lfs -text
+*.tgz filter=lfs diff=lfs merge=lfs -text
+*.wasm filter=lfs diff=lfs merge=lfs -text
+*.xz filter=lfs diff=lfs merge=lfs -text
+*.zip filter=lfs diff=lfs merge=lfs -text
+*.zst filter=lfs diff=lfs merge=lfs -text
+*tfevents* filter=lfs diff=lfs merge=lfs -text

README.md

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+---
+title: Lama
+emoji: 🐨
+colorFrom: red
+colorTo: green
+sdk: gradio
+sdk_version: 3.24.1
+app_file: app.py
+pinned: false
+duplicated_from: spuun/lama
+---
+
+Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference

app.py

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+from llama_cpp import Llama
+import gradio
+import random
+import requests
+import os
+import subprocess
+
+if not os.path.exists("ggml-model-q4_0.bin"):
+    open("ggml-model-q4_0.bin", "wb").write(
+        requests.get(
+            "https://huggingface.co/hlhr202/llama-7B-ggml-int4/resolve/main/ggml-model-q4_0.bin"
+        ).content
+    )
+    open("tokenizer.model", "wb").write(
+        requests.get(
+            "https://huggingface.co/decapoda-research/llama-7b-hf/resolve/main/tokenizer.model"
+        ).content
+    )
+    print("Downloaded model files. Doing conversion.")
+    print(
+        subprocess.check_output(
+            "python convert.py ggml-model-q4_0.bin --outfile ggml-model.bin", shell=True
+        ).decode("utf-8")
+    )
+else:
+    print("Model already exists, skipping redownload")
+
+
+print("Loading model...")
+llm = Llama(
+    model_path="ggml-model.bin",
+    seed=random.randint(1, 9999999),
+    n_ctx=2048,
+    n_threads=3,
+)
+print("Model loaded.")
+
+
+def generate(prompt, stop):
+    output = llm(
+        bytes(prompt, "utf-8").decode("unicode_escape"),
+        max_tokens=64,
+        temperature=0.75,
+        top_p=0.7,
+        stop=[bytes(stop, "utf-8").decode("unicode_escape")],
+    )
+    print(output)
+    return output["choices"][0]["text"]
+
+
+app = gradio.Interface(fn=generate, inputs=["text", "text"], outputs="text")
+app.launch(enable_queue=True, show_api=True)

convert.py

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+# Convert.py taken from https://github.com/ggerganov/llama.cpp
+import argparse
+import concurrent.futures
+import copy
+import enum
+import faulthandler
+import functools
+import io
+import itertools
+import json
+import math
+import mmap
+import pickle
+import re
+import signal
+import struct
+import sys
+import zipfile
+from abc import ABCMeta, abstractmethod
+from dataclasses import dataclass
+from pathlib import Path
+from typing import (IO, TYPE_CHECKING, Any, Callable, Dict, Iterable, List,
+                    Literal, Optional, Sequence, Tuple, TypeVar, Union)
+
+import numpy as np
+from sentencepiece import SentencePieceProcessor  # type: ignore
+
+if TYPE_CHECKING:
+    from typing_extensions import TypeAlias
+
+if hasattr(faulthandler, 'register') and hasattr(signal, 'SIGUSR1'):
+    faulthandler.register(signal.SIGUSR1)
+
+NDArray: 'TypeAlias' = 'np.ndarray[Any, Any]'
+
+
+@dataclass(frozen=True)
+class UnquantizedDataType:
+    name: str
+
+
+DT_F16 = UnquantizedDataType('F16')
+DT_F32 = UnquantizedDataType('F32')
+DT_I32 = UnquantizedDataType('I32')
+DT_BF16 = UnquantizedDataType('BF16')
+
+
+@dataclass(frozen=True)
+class QuantizedDataType:
+    groupsize: int
+    have_addends: bool
+    have_g_idx: bool
+
+
+DT_Q4_0 = QuantizedDataType(groupsize=32, have_addends=False, have_g_idx=False)
+DT_Q4_1 = QuantizedDataType(groupsize=32, have_addends=True, have_g_idx=False)
+
+DataType = Union[UnquantizedDataType, QuantizedDataType]
+
+DATA_TYPE_TO_FTYPE: Dict[DataType, int] = {
+    DT_F32: 0,
+    DT_F16: 1,
+    DT_Q4_0: 2,
+    DT_Q4_1: 3,
+}
+
+FTYPE_TO_DATA_TYPE: Dict[int, DataType] = \
+    {ftype: dtype for (dtype, ftype) in DATA_TYPE_TO_FTYPE.items()}
+
+DATA_TYPE_TO_NUMPY: Dict[DataType, 'np.dtype[Any]'] = {
+    DT_F16: np.dtype(np.float16),
+    DT_F32: np.dtype(np.float32),
+    DT_I32: np.dtype(np.int32),
+}
+
+NUMPY_TYPE_TO_DATA_TYPE: Dict['np.dtype[Any]', DataType] = \
+    {dtype: data_type for (data_type, dtype) in DATA_TYPE_TO_NUMPY.items()}
+
+
+class GGMLFileType(enum.Enum):
+    AllF32 = 0
+    MostlyF16 = 1  # except 1d tensors
+    MostlyQ4_0 = 2  # except 1d tensors
+    MostlyQ4_1 = 3  # except 1d tensors
+    PerLayerIsQ4_1 = 4  # but tok_embeddings.weight and output.weight are F16
+
+    def type_for_tensor(self, name: str, tensor: 'LazyTensor') -> DataType:
+        if len(tensor.shape) == 1:
+            # 1D tensors are always F32.
+            return DT_F32
+        elif self == GGMLFileType.AllF32:
+            return DT_F32
+        elif self == GGMLFileType.MostlyF16:
+            return DT_F16
+        elif self == GGMLFileType.MostlyQ4_0:
+            return DT_Q4_0
+        elif self == GGMLFileType.MostlyQ4_1:
+            return DT_Q4_1
+        elif self == GGMLFileType.PerLayerIsQ4_1:
+            if name in ('output.weight', 'tok_embeddings.weight'):
+                return DT_F16
+            else:
+                return DT_Q4_1
+        else:
+            raise ValueError(self)
+
+
+def make_tensors_list() -> List[str]:
+    ret = [
+        'tok_embeddings.weight',
+        'norm.weight',
+        'output.weight',
+    ]
+    for i in range(80):  # maximum number of layer
+        ret += [
+            f'layers.{i}.attention.wq.weight',
+            f'layers.{i}.attention.wk.weight',
+            f'layers.{i}.attention.wv.weight',
+            f'layers.{i}.attention.wo.weight',
+            f'layers.{i}.attention_norm.weight',
+            f'layers.{i}.feed_forward.w1.weight',
+            f'layers.{i}.feed_forward.w2.weight',
+            f'layers.{i}.feed_forward.w3.weight',
+            f'layers.{i}.atttention_norm.weight',
+            f'layers.{i}.ffn_norm.weight',
+        ]
+    return ret
+
+
+TENSORS_LIST = make_tensors_list()
+TENSORS_SET = set(TENSORS_LIST)
+
+
+@dataclass
+class Params:
+    n_vocab: int
+    n_embd: int
+    n_mult: int
+    n_head: int
+    n_layer: int
+    file_type: GGMLFileType
+
+    @staticmethod
+    def guessed(model: 'LazyModel', file_type: GGMLFileType) -> 'Params':
+        n_vocab, n_embd = model["tok_embeddings.weight"].shape
+
+        return Params(
+            n_vocab=n_vocab,
+            n_embd=n_embd,
+            n_mult=256,
+            n_head=n_embd // 128,
+            n_layer=next(i for i in itertools.count() if f"layers.{i}.attention.wq.weight" not in model),
+            file_type=file_type,
+        )
+
+
+class SentencePieceVocab:
+    def __init__(self, fname_tokenizer: Path, fname_added_tokens: Optional[Path]) -> None:
+        self.sentencepiece_tokenizer = SentencePieceProcessor(str(fname_tokenizer))
+        added_tokens: Dict[str, int]
+        if fname_added_tokens is not None:
+            added_tokens = json.load(open(fname_added_tokens))
+        else:
+            added_tokens = {}
+        vocab_size: int = self.sentencepiece_tokenizer.vocab_size()
+        expected_ids = list(range(vocab_size, vocab_size + len(added_tokens)))
+        actual_ids = sorted(added_tokens.values())
+        if expected_ids != actual_ids:
+            raise Exception(f"Expected added token IDs to be sequential and start at {len(added_tokens)}; got {actual_ids}")
+        items = sorted(added_tokens.items(), key=lambda text_idx: text_idx[1])
+        self.added_tokens_list = [text for (text, idx) in items]
+        self.vocab_size_base: int = vocab_size
+        self.vocab_size: int = self.vocab_size_base + len(self.added_tokens_list)
+        self.fname_tokenizer = fname_tokenizer
+        self.fname_added_tokens = fname_added_tokens
+
+    def sentencepiece_tokens(self) -> Iterable[Tuple[bytes, float]]:
+        tokenizer = self.sentencepiece_tokenizer
+        for i in range(tokenizer.vocab_size()):
+            text: bytes
+            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:
+                    raise Exception(f"Invalid token: {piece}")
+                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")
+            score: float = tokenizer.get_score(i)
+            yield text, score
+
+    def added_tokens(self) -> Iterable[Tuple[bytes, float]]:
+        for text in self.added_tokens_list:
+            score = -1000.0
+            yield text.encode("utf-8"), score
+
+    def all_tokens(self) -> Iterable[Tuple[bytes, float]]:
+        yield from self.sentencepiece_tokens()
+        yield from self.added_tokens()
+
+    def __repr__(self) -> str:
+        return f"<SentencePieceVocab with {self.vocab_size_base} base tokens and {len(self.added_tokens_list)} added tokens>"
+
+
+class GGMLVocab:
+    def __init__(self, tokens: List[Tuple[bytes, float]]):
+        self.tokens = tokens
+        self.vocab_size = len(tokens)
+
+    def all_tokens(self) -> Iterable[Tuple[bytes, float]]:
+        return self.tokens
+
+    def __repr__(self) -> str:
+        return f"<GGMLVocab with {self.vocab_size} tokens>"
+
+
+Vocab = Union[SentencePieceVocab, GGMLVocab]
+
+
+def permute(weights: NDArray, n_head: int) -> NDArray:
+    return (weights.reshape(n_head, 2, weights.shape[0] // n_head // 2, *weights.shape[1:])
+                   .swapaxes(1, 2)
+                   .reshape(weights.shape))
+
+
+def dequantize_q4(qvalues_pack32: NDArray, scales: NDArray, addends: Optional[NDArray], g_idx: Optional[NDArray]) -> NDArray:
+    # First reinterpret each row from a list of int32s containing 8 values each
+    # to a list of uint8s containing 2 values each.
+    qvalues_pack8 = qvalues_pack32.view(np.uint8)
+
+    # Then split out the two values per int8 (which requires an actual
+    # conversion because numpy doesn't natively support int4s).
+    qvalues = np.zeros([qvalues_pack8.shape[0], qvalues_pack8.shape[1] * 2], dtype=np.uint8)
+    qvalues[:, 0::2] = qvalues_pack8 & 0xf
+    qvalues[:, 1::2] = qvalues_pack8 >> 4
+
+    assert addends is None or addends.shape == scales.shape
+    assert qvalues.shape[0] == scales.shape[0]
+    assert qvalues.shape[1] % scales.shape[1] == 0
+    if g_idx is None:
+        repeat_count = qvalues.shape[1] // scales.shape[1]
+        scales = scales[:, :, np.newaxis]
+        if addends is not None:
+            addends = addends[:, :, np.newaxis]
+        # Reshape so that the below computation broadcasts over scales and addends:
+        qvalues.shape = (qvalues.shape[0], scales.shape[1], int(repeat_count))
+    else:
+        # In this case the scale and addend is selected for each column by g_idx:
+        assert addends is not None
+        scales = scales[:, g_idx]
+        addends = addends[:, g_idx]
+    if addends is None:
+        # Q4_0
+        qvalues = qvalues.view(np.int8)
+        qvalues -= 8
+    # And do the actual 'value = scale * qvalue + addend' computation.
+    values = scales * qvalues
+    if addends is not None:
+        values += addends
+    if g_idx is None:
+        values.shape = (values.shape[0], values.shape[1] * values.shape[2])
+    return values
+
+
+class Tensor(metaclass=ABCMeta):
+    data_type: DataType
+
+    @abstractmethod
+    def astype(self, data_type: DataType) -> 'Tensor': ...
+    @abstractmethod
+    def permute(self, n_head: int) -> 'Tensor': ...
+    @abstractmethod
+    def to_ggml(self) -> 'GGMLCompatibleTensor': ...
+
+
+class UnquantizedTensor(Tensor):
+    def __init__(self, ndarray: NDArray) -> None:
+        assert isinstance(ndarray, np.ndarray)
+        self.ndarray = ndarray
+        self.data_type = NUMPY_TYPE_TO_DATA_TYPE[ndarray.dtype]
+
+    def astype(self, data_type: DataType) -> Tensor:
+        dtype = DATA_TYPE_TO_NUMPY[data_type]
+        return UnquantizedTensor(self.ndarray.astype(dtype))
+
+    def to_ggml(self) -> 'UnquantizedTensor':
+        return self
+
+    def permute(self, n_head: int) -> 'UnquantizedTensor':
+        return UnquantizedTensor(permute(self.ndarray, n_head))
+
+
+def load_unquantized(lazy_tensor: 'LazyTensor', expected_dtype: Any = None, convert: bool = False) -> NDArray:
+    tensor = lazy_tensor.load()
+    assert isinstance(tensor, UnquantizedTensor)
+
+    # double-check:
+    actual_shape = list(tensor.ndarray.shape)
+    assert actual_shape == lazy_tensor.shape, (actual_shape, lazy_tensor.shape)
+    if expected_dtype is not None and expected_dtype != tensor.ndarray.dtype:
+        if convert:
+            tensor.ndarray = tensor.ndarray.astype(expected_dtype)
+        else:
+            raise ValueError(f'expected this tensor to have dtype {expected_dtype}, got {tensor.ndarray.dtype}')
+
+    return tensor.ndarray
+
+
+class GGMLQuantizedTensor(Tensor):
+    data_type: QuantizedDataType
+
+    def __init__(self, ndarray: NDArray, shape: List[int], data_type: DataType) -> None:
+        rows, columns = shape
+        assert data_type in (DT_Q4_1, DT_Q4_0)  # for now
+        assert isinstance(data_type, QuantizedDataType)  # redundant, but mypy complains without this
+        assert columns % data_type.groupsize == 0
+        words_in_block = 6 if data_type == DT_Q4_1 else 5
+        self.ndarray = ndarray.view(dtype=np.uint32).reshape((rows, columns // data_type.groupsize, words_in_block))
+        self.shape = shape[:]
+        self.data_type = data_type
+
+    def astype(self, data_type: DataType) -> Tensor:
+        if data_type == self.data_type:
+            return self
+        scales = self.ndarray[:, :, 0].view(np.float32)
+        if self.data_type.have_addends:
+            addends = self.ndarray[:, :, 1].view(np.float32)
+        else:
+            addends = None
+        qweights = self.ndarray[:, :, -4:].reshape([self.shape[0], self.shape[1] // 8])
+
+        dq = dequantize_q4(qweights, scales, addends, g_idx=None)
+        return UnquantizedTensor(dq).astype(data_type)
+
+    def to_ggml(self) -> 'GGMLQuantizedTensor':
+        return self
+
+    def permute(self, n_head: int) -> 'GGMLQuantizedTensor':
+        return GGMLQuantizedTensor(permute(self.ndarray, n_head), self.shape, self.data_type)
+
+
+GGMLCompatibleTensor = Union[UnquantizedTensor, GGMLQuantizedTensor]
+
+
+class DeferredPermutedTensor(Tensor):
+    def __init__(self, base: Tensor, n_head: int) -> None:
+        self.base = base
+        self.n_head = n_head
+        self.data_type = self.base.data_type
+
+    def astype(self, data_type: DataType) -> Tensor:
+        return self.base.astype(data_type).permute(self.n_head)
+
+    def to_ggml(self) -> GGMLCompatibleTensor:
+        return self.base.to_ggml().permute(self.n_head)
+
+    def permute(self, n_head: int) -> Tensor:
+        raise Exception("shouldn't permute twice")
+
+
+class GPTQForLLaMaQuantizedTensor(Tensor):
+    def __init__(self, model: 'LazyModel', namebase: str) -> None:
+        qweight = load_unquantized(model[f"{namebase}.qweight"], np.int32)
+        scales = load_unquantized(model[f"{namebase}.scales"], np.float32, convert=True)
+
+        bias = model.get(f"{namebase}.bias")
+        if bias is not None:
+            # Q4_1 does not support bias; good thing the bias is always all zeros.
+            assert not np.any(load_unquantized(bias))
+
+        if f"{namebase}.zeros" in model:
+            zeros = load_unquantized(model[f"{namebase}.zeros"], np.float32)
+        else:
+            qzeros = load_unquantized(model[f"{namebase}.qzeros"], np.int32)
+            assert qzeros.dtype == np.int32
+            zeros = dequantize_q4(qzeros, scales, scales, g_idx=None)
+            assert zeros.dtype == np.float32
+
+        assert zeros.shape == scales.shape
+
+        # Output is transposed compared to the input, and addends have their sign flipped.
+        # Scales and zeros similarly must be transposed but only for newer
+        # versions of GPTQ-for-LLaMa; the older versions can be identified by
+        # having shape (n_embd, 1).
+        qweight = qweight.T
+        if scales.shape[1] != 1:
+            scales = scales.T
+            zeros = zeros.T
+
+        # Output also has signs flipped for the addends.
+        self.qweight = qweight
+        self.scales = scales
+        self.addends = -zeros
+
+        self.g_idx: Optional[NDArray]
+        if f"{namebase}.g_idx" in model:
+            self.g_idx = load_unquantized(model[f"{namebase}.g_idx"], np.int32)
+            assert self.g_idx.shape == (qweight.shape[1] * 8,)
+        else:
+            self.g_idx = None
+
+        self.shape = [self.qweight.shape[0], self.qweight.shape[1] * 8]
+        self.data_type = QuantizedDataType(groupsize=self.groupsize(), have_addends=True,
+                                           have_g_idx=(self.g_idx is not None))
+
+    def inspect(self, row: int, col: int) -> None:
+        '''For debugging.'''
+        qweight = (self.qweight[row, col // 8] >> (4 * (col & 7))) & 0xf
+        if self.g_idx is not None:
+            group = self.g_idx[col]
+        else:
+            group = int(col // self.groupsize())
+        scale = self.scales[row, group]
+        addend = self.addends[row, group]
+        with np.printoptions(precision=None, suppress=True):
+            print(f'scale:{scale} addend:{addend} qweight:{qweight}')
+            print('possible values:', np.arange(16) * scale + addend)
+            print('actual value:', qweight * scale + addend)
+
+    def astype(self, data_type: DataType) -> Tensor:
+        if isinstance(data_type, QuantizedDataType):
+            assert self.g_idx is None and data_type.have_addends is True and data_type.have_g_idx is False
+            return self.regroup(data_type.groupsize)
+
+        dequantized = dequantize_q4(np.ascontiguousarray(self.qweight), self.scales, self.addends, self.g_idx)
+        return UnquantizedTensor(dequantized).astype(data_type)
+
+    def groupsize(self) -> int:
+        assert self.addends.shape == self.scales.shape
+        assert self.shape[1] % self.scales.shape[1] == 0
+        return self.shape[1] // self.scales.shape[1]
+
+    def regroup(self, new_groupsize: int = 32) -> 'GPTQForLLaMaQuantizedTensor':
+        # Old versions of GPTQ-for-LLaMa shared scales and addends between all the
+        # columns in a row.  Newer versions share them between every set of N
+        # columns in a row, where N is the `groupsize` parameter, usually 128.  The
+        # output format shares them between every set of 32 columns.  To handle
+        # this, duplicate scales and addends for every smaller group.
+        # (In the above, 'row' and 'column' are in the sense of the output.)
+        assert self.g_idx is None
+        old_groupsize = self.groupsize()
+        assert old_groupsize >= new_groupsize and old_groupsize % new_groupsize == 0, old_groupsize
+        ret = copy.copy(self)
+        ret.addends = self.addends.repeat(old_groupsize // new_groupsize, axis=1)
+        ret.scales = self.scales.repeat(old_groupsize // new_groupsize, axis=1)
+        ret.data_type = QuantizedDataType(groupsize=new_groupsize, have_addends=True, have_g_idx=False)
+        return ret
+
+    def permute(self, n_head: int) -> Tensor:
+        return DeferredPermutedTensor(self, n_head)
+
+    def to_ggml(self) -> GGMLQuantizedTensor:
+        # The output format 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)
+
+        if self.groupsize() != 32:
+            raise Exception("should have been regrouped before converting to ggml")
+
+        # 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 = self.addends.view(dtype=np.int32)[:, :, np.newaxis]
+        scales_view = self.scales.view(dtype=np.int32)[:, :, np.newaxis]
+
+        # Split into groups of 4 columns (i.e. 32 columns of quantized data):
+        grouped = self.qweight.reshape([self.qweight.shape[0], self.qweight.shape[1] // 4, 4])
+
+        # And concatenate:
+        grouped = np.concatenate([scales_view, addends_view, grouped], axis=2, casting='no')
+
+        return GGMLQuantizedTensor(grouped, self.shape, DT_Q4_1)
+
+
+@dataclass
+class LazyTensor:
+    _load: Callable[[], Tensor]
+    shape: List[int]
+    data_type: DataType
+    description: str
+
+    def load(self) -> Tensor:
+        ret = self._load()
+        assert ret.data_type == self.data_type, (self.data_type, ret.data_type, self.description)
+        return ret
+
+    def astype(self, data_type: DataType) -> 'LazyTensor':
+        self.validate_conversion_to(data_type)
+
+        def load() -> Tensor:
+            return self.load().astype(data_type)
+        return LazyTensor(load, self.shape, data_type, f'convert({data_type}) {self.description}')
+
+    def validate_conversion_to(self, data_type: DataType) -> None:
+        if data_type == self.data_type:
+            return
+        if isinstance(data_type, QuantizedDataType):
+            if not isinstance(self.data_type, QuantizedDataType):
+                raise Exception(f"Can't turn an unquantized tensor into a quantized type ({data_type})")
+            if self.data_type.have_g_idx:
+                sys.stderr.write("Error: Input uses the newer GPTQ-for-LLaMa format (using g_idx), which is not yet natively supported by GGML.  For now you can still convert this model by passing `--outtype f16` to dequantize, but that will result in a much larger output file for no quality benefit.\n")
+                sys.exit(1)
+            assert not data_type.have_g_idx and self.data_type.have_addends and data_type.have_addends
+
+
+LazyModel = Dict[str, LazyTensor]
+
+
+@dataclass
+class ModelPlus:
+    model: LazyModel
+    paths: List[Path]  # Where this was read from.
+    format: Literal['ggml', 'torch', 'safetensors']
+    vocab: Optional[Vocab]  # For GGML models (which have vocab built in), the vocab.
+
+
+def merge_sharded(models: List[LazyModel]) -> LazyModel:
+    # Original LLaMA models have each file contain one part of each tensor.
+    # Use a dict instead of a set to preserve order.
+    names = {name: None for model in models for name in model}
+
+    def convert(name: str) -> LazyTensor:
+        lazy_tensors: List[LazyTensor] = [model[name] for model in models]
+        if len(lazy_tensors) == 1:
+            # only one file; don't go through this procedure since there might
+            # be quantized tensors
+            return lazy_tensors[0]
+        if len(lazy_tensors[0].shape) == 1:
+            # the tensor is just duplicated in every file
+            return lazy_tensors[0]
+        if name.startswith('tok_embeddings.') or \
+           name.endswith('.attention.wo.weight') or \
+           name.endswith('.feed_forward.w2.weight'):
+            # split by columns
+            axis = 1
+        else:
+            # split by rows
+            axis = 0
+        concatenated_shape = list(lazy_tensors[0].shape)
+        concatenated_shape[axis] = sum(tensor.shape[axis] for tensor in lazy_tensors)
+
+        def load() -> UnquantizedTensor:
+            ndarrays = [load_unquantized(tensor) for tensor in lazy_tensors]
+            concatenated: NDArray = np.concatenate(ndarrays, axis=axis)
+            return UnquantizedTensor(concatenated)
+        description = 'concatenated[[' + '] | ['.join(lt.description for lt in lazy_tensors) + ']]'
+        return LazyTensor(load, concatenated_shape, lazy_tensors[0].data_type, description)
+    return {name: convert(name) for name in names}
+
+
+def merge_multifile_models(models_plus: List[ModelPlus]) -> ModelPlus:
+    formats = set(mp.format for mp in models_plus)
+    assert len(formats) == 1, "different formats?"
+    format = formats.pop()
+    paths = [path for mp in models_plus for path in mp.paths]
+    # Use the first non-None vocab, if any.
+    try:
+        vocab = next(mp.vocab for mp in models_plus if mp.vocab is not None)
+    except StopIteration:
+        vocab = None
+
+    if any("model.embed_tokens.weight" in mp.model for mp in models_plus):
+        # Transformers models put different tensors in different files, but
+        # don't split indivdual tensors between files.
+        model: LazyModel = {}
+        for mp in models_plus:
+            model.update(mp.model)
+    else:
+        model = merge_sharded([mp.model for mp in models_plus])
+
+    return ModelPlus(model, paths, format, vocab)
+
+
+def permute_lazy(lazy_tensor: LazyTensor, n_head: int) -> LazyTensor:
+    def load() -> Tensor:
+        return lazy_tensor.load().permute(n_head)
+    return LazyTensor(load, lazy_tensor.shape, lazy_tensor.data_type, f'permute({n_head}) ' + lazy_tensor.description)
+
+
+def convert_transformers_to_orig(model: LazyModel) -> LazyModel:
+    out: LazyModel = {}
+    out["tok_embeddings.weight"] = model["model.embed_tokens.weight"]
+    out["norm.weight"] = model["model.norm.weight"]
+    out["output.weight"] = model["lm_head.weight"]
+
+    n_head = model["model.layers.0.self_attn.q_proj.weight"].shape[1] // 128
+    for i in itertools.count():
+        if f"model.layers.{i}.self_attn.q_proj.weight" not in model:
+            break
+        out[f"layers.{i}.attention.wq.weight"] = permute_lazy(model[f"model.layers.{i}.self_attn.q_proj.weight"], n_head)
+        out[f"layers.{i}.attention.wk.weight"] = permute_lazy(model[f"model.layers.{i}.self_attn.k_proj.weight"], n_head)
+        out[f"layers.{i}.attention.wv.weight"] = model[f"model.layers.{i}.self_attn.v_proj.weight"]
+        out[f"layers.{i}.attention.wo.weight"] = model[f"model.layers.{i}.self_attn.o_proj.weight"]
+
+        out[f"layers.{i}.feed_forward.w1.weight"] = model[f"model.layers.{i}.mlp.gate_proj.weight"]
+        out[f"layers.{i}.feed_forward.w2.weight"] = model[f"model.layers.{i}.mlp.down_proj.weight"]
+        out[f"layers.{i}.feed_forward.w3.weight"] = model[f"model.layers.{i}.mlp.up_proj.weight"]
+
+        out[f"layers.{i}.attention_norm.weight"] = model[f"model.layers.{i}.input_layernorm.weight"]
+        out[f"layers.{i}.ffn_norm.weight"] = model[f"model.layers.{i}.post_attention_layernorm.weight"]
+    return out
+
+
+def handle_quantization(model: LazyModel) -> LazyModel:
+    '''Convert a model with entries for 'foo.qweight', 'foo.scales', etc.
+    (which resolve to UnquantizedTensors with the raw data) to one with entries
+    for 'foo.weight' (which resolve to QuantizedTensors).
+    '''
+    def convert(name: str) -> Tuple[str, LazyTensor]:
+        if name.endswith(".qweight"):
+            namebase = name.rsplit('.', 1)[0]
+            orig_name = namebase + ".weight"
+
+            lazy_tensor = model[name]
+            assert len(lazy_tensor.shape) == 2
+            real_shape = [lazy_tensor.shape[1], lazy_tensor.shape[0] * 8]
+
+            # Calculate type.  This replicates the logic in
+            # GPTQForLLaMaQuantizedTensor (which is executed when the modelis
+            # actually loaded).
+            lazy_scales = model[f"{namebase}.scales"]
+            scales_width = 1 if lazy_scales.shape[1] == 1 else lazy_scales.shape[0]
+            assert real_shape[1] % scales_width == 0
+            groupsize = real_shape[1] // scales_width
+            have_g_idx = f"{namebase}.g_idx" in model
+            data_type = QuantizedDataType(groupsize=groupsize, have_addends=True, have_g_idx=have_g_idx)
+
+            def load() -> Tensor:
+                return GPTQForLLaMaQuantizedTensor(model, namebase)
+
+            return (orig_name, LazyTensor(load, real_shape, data_type, '[quantized]'))
+        else:
+            return (name, model[name])
+    return dict(convert(name) for name in model)
+
+# Functionality that simulates `torch.load` but where individual tensors are
+# only loaded into memory on demand, not all at once.
+# PyTorch can't do this natively as of time of writing:
+# - https://github.com/pytorch/pytorch/issues/64327
+# This allows us to de-shard without multiplying RAM usage, and also
+# conveniently drops the PyTorch dependency (though we still need numpy).
+
+
+@dataclass
+class LazyStorageKind:
+    data_type: DataType
+
+
+@dataclass
+class LazyStorage:
+    load: Callable[[int, int], NDArray]
+    kind: LazyStorageKind
+    description: str
+
+
+class LazyUnpickler(pickle.Unpickler):
+    def __init__(self, fp: IO[bytes], data_base_path: str, zip_file: zipfile.ZipFile):
+        super().__init__(fp)
+        self.data_base_path = data_base_path
+        self.zip_file = zip_file
+
+    def persistent_load(self, pid: Any) -> Any:
+        assert pid[0] == 'storage'
+        assert isinstance(pid[1], LazyStorageKind)
+        data_type = pid[1].data_type
+        filename_stem = pid[2]
+        filename = self.data_base_path + '/' + filename_stem
+        info = self.zip_file.getinfo(filename)
+
+        def load(offset: int, elm_count: int) -> NDArray:
+            dtype = DATA_TYPE_TO_NUMPY.get(data_type)
+            if dtype is None:
+                raise Exception("tensor stored in unsupported format")
+            fp = self.zip_file.open(info)
+            fp.seek(offset * dtype.itemsize)
+            size = elm_count * dtype.itemsize
+            data = fp.read(size)
+            assert len(data) == size
+            return np.frombuffer(data, dtype)
+        description = f'storage data_type={data_type} path-in-zip={filename} path={self.zip_file.filename}'
+        return LazyStorage(load=load, kind=pid[1], description=description)
+
+    def lazy_rebuild_tensor_v2(storage: Any, storage_offset: Any, size: Any, stride: Any,  # pyright: ignore[reportSelfClsParameterName]
+                               requires_grad: Any, backward_hooks: Any, metadata: Any = None) -> LazyTensor:
+        assert isinstance(storage, LazyStorage)
+
+        def load() -> UnquantizedTensor:
+            elm_count = stride[0] * size[0]
+            return UnquantizedTensor(storage.load(storage_offset, elm_count).reshape(size))
+        description = f'pickled storage_offset={storage_offset} in {storage.description}'
+        return LazyTensor(load, list(size), storage.kind.data_type, description)
+
+    CLASSES: Dict[Any, Any] = {
+        ('torch._utils', '_rebuild_tensor_v2'): lazy_rebuild_tensor_v2,
+        ('torch', 'BFloat16Storage'): LazyStorageKind(DT_BF16),
+        ('torch', 'HalfStorage'): LazyStorageKind(DT_F16),
+        ('torch', 'FloatStorage'): LazyStorageKind(DT_F32),
+        ('torch', 'IntStorage'): LazyStorageKind(DT_I32),
+    }
+
+    def find_class(self, module: str, name: str) -> Any:
+        if not module.startswith('torch'):
+            return super().find_class(module, name)
+        return self.CLASSES[(module, name)]
+
+
+def lazy_load_torch_file(outer_fp: IO[bytes], path: Path) -> ModelPlus:
+    zf = zipfile.ZipFile(outer_fp)
+    pickle_paths = [name for name in zf.namelist() if name.endswith('.pkl')]
+    assert len(pickle_paths) == 1, pickle_paths
+    pickle_fp = zf.open(pickle_paths[0], 'r')
+    unpickler = LazyUnpickler(pickle_fp,
+                              data_base_path=pickle_paths[0][:-4],
+                              zip_file=zf)
+    model = unpickler.load()
+    as_dict = dict(model.items())
+    return ModelPlus(model=as_dict, paths=[path], format='torch', vocab=None)
+
+
+SAFETENSORS_DATA_TYPES: Dict[str, DataType] = {
+    'F16': DT_F16,
+    'F32': DT_F32,
+    'I32': DT_I32,
+}
+
+
+def lazy_load_safetensors_file(fp: IO[bytes], path: Path) -> ModelPlus:
+    header_size, = struct.unpack('<Q', fp.read(8))
+    header: Dict[str, Dict[str, Any]] = json.loads(fp.read(header_size))
+    # Use mmap for the actual data to avoid race conditions with the file offset.
+    mapped = memoryview(mmap.mmap(fp.fileno(), 0, access=mmap.ACCESS_READ))
+    byte_buf = mapped[8 + header_size:]
+
+    def convert(info: Dict[str, Any]) -> LazyTensor:
+        data_type = SAFETENSORS_DATA_TYPES[info['dtype']]
+        numpy_dtype = DATA_TYPE_TO_NUMPY[data_type]
+        shape: List[int] = info['shape']
+        begin, end = info['data_offsets']
+        assert 0 <= begin <= end <= len(byte_buf)
+        assert end - begin == math.prod(shape) * numpy_dtype.itemsize
+        buf = byte_buf[begin:end]
+
+        def load() -> UnquantizedTensor:
+            return UnquantizedTensor(np.frombuffer(buf, dtype=numpy_dtype).reshape(shape))
+        description = f'safetensors begin={begin} end={end} type={data_type} path={path}'
+        return LazyTensor(load, shape, data_type, description)
+    model = {name: convert(info) for (name, info) in header.items()}
+    return ModelPlus(model=model, paths=[path], format='safetensors', vocab=None)
+
+
+def must_read(fp: IO[bytes], length: int) -> bytes:
+    ret = fp.read(length)
+    if len(ret) < length:
+        raise Exception("unexpectedly reached end of file")
+    return ret
+
+
+def lazy_load_ggml_file(fp: io.BufferedReader, path: Path) -> ModelPlus:
+    magic = must_read(fp, 4)[::-1]
+    if magic in (b'ggmf', b'ggjt'):
+        version, = struct.unpack("i", must_read(fp, 4))
+        assert version == 1
+    else:
+        assert magic == b'ggml'
+        version = None
+    n_vocab, n_embd, n_mult, n_head, n_layer, rot, file_type = struct.unpack('<7i', must_read(fp, 28))
+
+    tokens: List[Tuple[bytes, float]] = []
+    for i in range(n_vocab):
+        if i == 32000:
+            # HACK: GPT4All messed with the format without changing the magic
+            # number.  Specifically, they changed the vocab section to contain
+            # `n_vocab - 1` tokens instead of `n_vocab` (i.e. omitting the
+            # extra pad token).  Try to detect if we're reading a file like
+            # this.
+            orig_pos = fp.tell()
+            fp.seek(20, io.SEEK_CUR)
+            is_gpt4all = fp.read(21) == b'tok_embeddings.weight'
+            fp.seek(orig_pos)
+            if is_gpt4all:
+                break
+
+        length, = struct.unpack("i", must_read(fp, 4))
+        text = must_read(fp, length)
+        if magic != b'ggml':
+            score, = struct.unpack("f", must_read(fp, 4))
+            tokens.append((text, score))
+    vocab = GGMLVocab(tokens) if magic != b'ggml' else None
+
+    model: LazyModel = {}
+    # Use mmap for the actual data to avoid race conditions with the file offset.
+    off = fp.raw.tell()
+    mapped = memoryview(mmap.mmap(fp.fileno(), 0, access=mmap.ACCESS_READ))
+    fp.raw.seek(off) # needed on Windows
+
+    def read_tensor() -> None:  # this is a function so that variables captured in `load` don't change
+        shape_len, name_len, ftype = struct.unpack("iii", must_read(fp, 12))
+        assert 0 <= shape_len <= 3
+        shape: List[int] = list(struct.unpack(f"{shape_len}i", must_read(fp, 4 * shape_len)))
+        shape = shape[::-1]
+        name = must_read(fp, name_len).decode('utf-8')
+        data_type = FTYPE_TO_DATA_TYPE[ftype]
+
+        if magic == b'ggjt':
+            fp.seek((fp.tell() + 31) & -32)
+
+        if data_type == DT_Q4_1:
+            # See GPTQForLLaMaQuantizedTensor.ggml_ndarray()
+            size = 24 * (shape[1] // 32) * shape[0]
+        elif data_type == DT_Q4_0:
+            size = 20 * (shape[1] // 32) * shape[0]
+        else:
+            numpy_dtype = DATA_TYPE_TO_NUMPY[data_type]
+            elm_count = math.prod(shape)
+            size = elm_count * numpy_dtype.itemsize
+        offset = fp.tell()
+        buf = mapped[offset:offset+size]
+        fp.seek(size, io.SEEK_CUR)
+
+        def load() -> Tensor:
+            if isinstance(data_type, QuantizedDataType):
+                ndarray = np.frombuffer(buf, dtype=np.uint32)
+                return GGMLQuantizedTensor(ndarray, shape, data_type)
+            else:
+                return UnquantizedTensor(np.frombuffer(buf, dtype=numpy_dtype).reshape(shape))
+        description = f'ggml offset={offset} type={data_type} path={path}'
+        model[name] = LazyTensor(load, shape, data_type, description)
+
+    while fp.read(1) != b'':
+        fp.seek(-1, io.SEEK_CUR)
+        read_tensor()
+
+    return ModelPlus(model=model, paths=[path], format='ggml', vocab=vocab)
+
+
+@functools.lru_cache(maxsize=None)
+def lazy_load_file(path: Path) -> ModelPlus:
+    fp = open(path, 'rb')
+    first8 = fp.read(8)
+    fp.seek(0)
+    if first8[:2] == b'PK':
+        # A zip file, i.e. PyTorch format
+        return lazy_load_torch_file(fp, path)
+    elif first8[2:4] == b'gg':
+        # GGML format
+        return lazy_load_ggml_file(fp, path)
+    elif struct.unpack('<Q', first8)[0] < 16 * 1024 * 1024:
+        # Probably safetensors
+        return lazy_load_safetensors_file(fp, path)
+    else:
+        raise ValueError(f"unknown format: {path}")
+
+
+In = TypeVar('In')
+Out = TypeVar('Out')
+
+
+def bounded_parallel_map(func: Callable[[In], Out], iterable: Iterable[In], concurrency: int) -> Iterable[Out]:
+    '''Parallel map, but with backpressure.  If the caller doesn't call `next`
+    fast enough, this will stop calling `func` at some point rather than
+    letting results pile up in memory.  Specifically, there is a max of one
+    output value buffered per thread.'''
+    with concurrent.futures.ThreadPoolExecutor() as executor:
+        futures: List[concurrent.futures.Future[Out]] = []
+        items_rev = list(iterable)[::-1]
+        for i in range(min(concurrency, len(items_rev))):
+            futures.append(executor.submit(func, items_rev.pop()))
+        while futures:
+            result = futures.pop(0).result()
+            if items_rev:
+                futures.append(executor.submit(func, items_rev.pop()))
+            yield result
+
+
+def check_vocab_size(params: Params, vocab: Vocab) -> None:
+    if params.n_vocab != vocab.vocab_size:
+        # GGMLVocab comes from the same file as the model so shouldn't mismatch:
+        assert isinstance(vocab, SentencePieceVocab)
+        if params.n_vocab == vocab.vocab_size_base:
+            print("Ignoring added_tokens.json since model matches vocab size without it.")
+            vocab.added_tokens_list = []
+            vocab.vocab_size = vocab.vocab_size_base
+            return
+        msg = f"Vocab size mismatch (model has {params.n_vocab}, but {vocab.fname_tokenizer}"
+        if vocab.fname_added_tokens is not None:
+            msg += f" combined with {vocab.fname_added_tokens}"
+        msg += f" has {vocab.vocab_size})."
+        if vocab.vocab_size < params.n_vocab < vocab.vocab_size + 20 and vocab.fname_added_tokens is None:
+            msg += f"  Most likely you are missing added_tokens.json (should be in {vocab.fname_tokenizer.parent})."
+        raise Exception(msg)
+
+
+class OutputFile:
+    def __init__(self, fname_out: Path) -> None:
+        self.fout = open(fname_out, "wb")
+
+    def write_file_header(self, params: Params) -> None:
+        self.fout.write(b"ggjt"[::-1])  # magic
+        values = [
+            1,  # file version
+            params.n_vocab,
+            params.n_embd,
+            params.n_mult,
+            params.n_head,
+            params.n_layer,
+            params.n_embd // params.n_head,  # rot (obsolete)
+            params.file_type.value,
+        ]
+        self.fout.write(struct.pack("i" * len(values), *values))
+
+    def write_tensor_header(self, name: str, shape: Sequence[int], data_type: DataType) -> None:
+        sname = name.encode('utf-8')
+        self.fout.write(struct.pack("iii", len(shape), len(sname), DATA_TYPE_TO_FTYPE[data_type]))
+        self.fout.write(struct.pack("i" * len(shape), *shape[::-1]))
+        self.fout.write(sname)
+        self.fout.seek((self.fout.tell() + 31) & -32)
+
+    def write_vocab(self, vocab: Vocab) -> None:
+        for text, score in vocab.all_tokens():
+            self.fout.write(struct.pack("i", len(text)))
+            self.fout.write(text)
+            self.fout.write(struct.pack("f", score))
+
+    @staticmethod
+    def write_vocab_only(fname_out: Path, vocab: Vocab) -> None:
+        of = OutputFile(fname_out)
+        params = Params(n_vocab=vocab.vocab_size, n_embd=0, n_mult=0,
+                        n_head=1, n_layer=0, file_type=GGMLFileType.AllF32)
+        of = OutputFile(fname_out)
+        of.write_file_header(params)
+        of.write_vocab(vocab)
+        of.fout.close()
+
+    @staticmethod
+    def write_all(fname_out: Path, params: Params, model: LazyModel, vocab: Vocab) -> None:
+        check_vocab_size(params, vocab)
+        of = OutputFile(fname_out)
+        of.write_file_header(params)
+        print("Writing vocab...")
+        of.write_vocab(vocab)
+
+        def do_item(item: Tuple[str, LazyTensor]) -> NDArray:
+            name, lazy_tensor = item
+            return lazy_tensor.load().to_ggml().ndarray
+
+        ndarrays = bounded_parallel_map(do_item, model.items(), concurrency=8)
+        for i, ((name, lazy_tensor), ndarray) in enumerate(zip(model.items(), ndarrays)):
+            size = ' x '.join(f"{dim:6d}" for dim in lazy_tensor.shape)
+            padi = len(str(len(model)))
+            print(f"[{i+1:{padi}d}/{len(model)}] Writing tensor {name:38s} | size {size:16} | type {lazy_tensor.data_type}")
+            of.write_tensor_header(name, lazy_tensor.shape, lazy_tensor.data_type)
+            ndarray.tofile(of.fout)
+        of.fout.close()
+
+
+def pick_output_type(model: LazyModel, output_type_str: Optional[str]) -> GGMLFileType:
+    wq_type = model["layers.0.attention.wq.weight"].data_type
+    if output_type_str == "f32" or (output_type_str is None and wq_type == DT_F32):
+        return GGMLFileType.AllF32
+    if output_type_str == "f16" or (output_type_str is None and wq_type == DT_F16):
+        return GGMLFileType.MostlyF16
+    if output_type_str == "q4_1" or (output_type_str is None and isinstance(wq_type, QuantizedDataType) and
+                                     wq_type.have_addends):
+        if isinstance(model["output.weight"].data_type, QuantizedDataType):
+            return GGMLFileType.MostlyQ4_1
+        else:
+            return GGMLFileType.PerLayerIsQ4_1
+    if output_type_str == "q4_0" or (output_type_str is None and isinstance(wq_type, QuantizedDataType)):
+        return GGMLFileType.MostlyQ4_0
+    name_to_type = {name: lazy_tensor.data_type for (name, lazy_tensor) in model.items()}
+    raise Exception(f"Unexpected combination of types: {name_to_type}")
+
+
+def do_necessary_conversions(model: LazyModel) -> LazyModel:
+    model = handle_quantization(model)
+
+    if "lm_head.weight" in model:
+        model = convert_transformers_to_orig(model)
+    model = filter_and_sort_tensors(model)
+
+    return model
+
+
+def convert_to_output_type(model: LazyModel, output_type: GGMLFileType) -> LazyModel:
+    return {name: tensor.astype(output_type.type_for_tensor(name, tensor))
+            for (name, tensor) in model.items()}
+
+
+def nth_multifile_path(path: Path, n: int) -> Optional[Path]:
+    '''Given any path belonging to a multi-file model (e.g. foo.bin.1), return
+    the nth path in the model.
+    '''
+    # Support the following patterns:
+    patterns: List[Tuple[str, str]] = [
+        # - x.00.pth, x.01.pth, etc.
+        (r'\.[0-9]{2}\.pth$', f'.{n:02}.pth'),
+        # - x-00001-of-00002.bin, x-00002-of-00002.bin, etc.
+        (r'-[0-9]{5}-of-(.*)$', fr'-{n:05}-of-\1'),
+        # x.bin, x.bin.1, etc.
+        (r'(\.[0-9]+)?$', r'\1' if n == 0 else fr'\1.{n}')
+    ]
+    for regex, replacement in patterns:
+        if re.search(regex, path.name):
+            new_path = path.with_name(re.sub(regex, replacement, path.name))
+            if new_path.exists():
+                return new_path
+    return None
+
+
+def find_multifile_paths(path: Path) -> List[Path]:
+    '''Given any path belonging to a multi-file model (e.g. foo.bin.1), return
+    the whole list of paths in the model.
+    '''
+    ret: List[Path] = []
+    for i in itertools.count():
+        nth_path = nth_multifile_path(path, i)
+        if nth_path is None:
+            break
+        ret.append(nth_path)
+    if not ret:
+        # No matches.  This should only happen if the file was named, e.g.,
+        # foo.0, and there was no file named foo.  Oh well, try to process it
+        # as a single file.
+        return [path]
+    return ret
+
+
+def load_some_model(path: Path) -> ModelPlus:
+    '''Load a model of any supported format.'''
+    # Be extra-friendly and accept either a file or a directory:
+    if path.is_dir():
+        globs = ["consolidated.00.pth", "pytorch_model-00001-of-*.bin", "*.pt"]
+        files = [file for glob in globs for file in path.glob(glob)]
+        if not files:
+            # Try GGML too, but with lower priority, since if both a non-GGML
+            # model and a GGML model exist in the same directory, we assume the
+            # latter was converted from the former.
+            files = list(path.glob("ggml-model*.bin*"))
+        if not files:
+            raise Exception(f"Can't find model in directory {path}")
+        if len(files) > 1:
+            raise Exception(f"Found multiple models in {path}, not sure which to pick: {files}")
+        path = files[0]
+
+    paths = find_multifile_paths(path)
+    models_plus: List[ModelPlus] = []
+    for path in paths:
+        print(f"Loading model file {path}")
+        models_plus.append(lazy_load_file(path))
+
+    model_plus = merge_multifile_models(models_plus)
+    return model_plus
+
+
+def filter_and_sort_tensors(model: LazyModel) -> LazyModel:
+    return {name: model[name] for name in TENSORS_LIST if name in model}
+
+
+def load_vocab(path: Path) -> SentencePieceVocab:
+    # Be extra-friendly and accept either a file or a directory.  Also, if it's
+    # a directory, it might be the model directory, and tokenizer.model might
+    # be in the parent of that.
+    if path.is_dir():
+        path2 = path / "tokenizer.model"
+        # Use `.parent` instead of /.. to handle the symlink case better.
+        path3 = path.parent / "tokenizer.model"
+        if path2.exists():
+            path = path2
+        elif path3.exists():
+            path = path3
+        else:
+            raise FileNotFoundError(f"Could not find tokenizer.model in {path} or its parent; if it's in another directory, pass the directory as --vocab-dir")
+    added_tokens_path = path.parent / "added_tokens.json"
+    print(f"Loading vocab file {path}")
+    return SentencePieceVocab(path, added_tokens_path if added_tokens_path.exists() else None)
+
+
+def default_outfile(model_paths: List[Path], params: Params) -> Path:
+    namestr = {
+        GGMLFileType.AllF32: "f32",
+        GGMLFileType.MostlyF16: "f16",
+        GGMLFileType.MostlyQ4_1: "q4_1",
+        GGMLFileType.PerLayerIsQ4_1: "q4_1",
+    }[params.file_type]
+    ret = model_paths[0].parent / f"ggml-model-{namestr}.bin"
+    if ret in model_paths:
+        sys.stderr.write(f"Error: Default output path ({ret}) would overwrite the input.  Please explicitly specify a path using --outfile.\n")
+        sys.exit(1)
+    return ret
+
+
+def do_dump_model(model_plus: ModelPlus) -> None:
+    print(f"model_plus.paths = {model_plus.paths!r}")
+    print(f"model_plus.format = {model_plus.format!r}")
+    print(f"model_plus.vocab = {model_plus.vocab!r}")
+    for name, lazy_tensor in model_plus.model.items():
+        print(f"{name}: shape={lazy_tensor.shape} type={lazy_tensor.data_type}; {lazy_tensor.description}")
+
+
+def main(args_in: Optional[List[str]] = None) -> None:
+    parser = argparse.ArgumentParser(description="Convert a LLaMa model to a GGML compatible file")
+    parser.add_argument("--dump", action="store_true", help="don't convert, just show what's in the model")
+    parser.add_argument("--dump-single", action="store_true", help="don't convert, just show what's in a single model file")
+    parser.add_argument("--vocab-only", action="store_true", help="extract only the vocab")
+    parser.add_argument("--outtype", choices=["f32", "f16", "q4_1"], help="output format (default: based on input)")
+    parser.add_argument("--vocab-dir", type=Path, help="directory containing tokenizer.model, if separate from model file")
+    parser.add_argument("--outfile", type=Path, help="path to write to; default: based on input")
+    parser.add_argument("model", type=Path, help="directory containing model file, or model file itself (*.pth, *.pt, *.bin)")
+    args = parser.parse_args(args_in)
+
+    vocab: Vocab
+    if args.dump_single:
+        model_plus = lazy_load_file(args.model)
+        do_dump_model(model_plus)
+    elif args.vocab_only:
+        vocab = load_vocab(args.vocab_dir or args.model)
+        assert args.outfile, "need --outfile if using --vocab-only"
+        outfile = args.outfile
+        OutputFile.write_vocab_only(outfile, vocab)
+        print(f"Wrote {outfile}")
+    else:
+        model_plus = load_some_model(args.model)
+        if args.dump:
+            do_dump_model(model_plus)
+            return
+        if model_plus.vocab is not None and args.vocab_dir is None:
+            vocab = model_plus.vocab
+        else:
+            vocab_dir = args.vocab_dir if args.vocab_dir else model_plus.paths[0].parent
+            vocab = load_vocab(vocab_dir)
+        model = model_plus.model
+        model = do_necessary_conversions(model)
+        output_type = pick_output_type(model, args.outtype)
+        model = convert_to_output_type(model, output_type)
+        params = Params.guessed(model, output_type)
+        outfile = args.outfile or default_outfile(model_plus.paths, params)
+        OutputFile.write_all(outfile, params, model, vocab)
+        print(f"Wrote {outfile}")
+
+
+if __name__ == '__main__':
+    main()

requirements.txt

@@ -0,0 +1,3 @@
+llama-cpp-python
+numpy==1.24
+sentencepiece==0.1.98