First pass at converting GGMLv3 LLaMA models to GGUF

KerfuffleV2 · KerfuffleV2 · commit 8afc1ef312f2 · 2023-08-21T04:34:02.000-06:00
diff --git a/convert-llama-ggmlv3-to-gguf.py b/convert-llama-ggmlv3-to-gguf.py
@@ -0,0 +1,223 @@
+import sys, struct, math, argparse
+
+import numpy as np
+
+import gguf
+
+# Note: Does not support GGML_QKK_64
+QK_K = 256
+# Items here are (block size, type size)
+GGML_QUANT_SIZES = {
+    gguf.GGMLQuantizationType.F32  : (1, 4),
+    gguf.GGMLQuantizationType.F16  : (1, 2),
+    gguf.GGMLQuantizationType.Q4_0 : (32, 2 + 16),
+    gguf.GGMLQuantizationType.Q4_1 : (32, 2 + 2 + 16),
+    gguf.GGMLQuantizationType.Q5_0 : (32, 2 + 4 + 16),
+    gguf.GGMLQuantizationType.Q5_1 : (32, 2 + 2 + 4 + 16),
+    gguf.GGMLQuantizationType.Q8_0 : (32, 2 + 32),
+    gguf.GGMLQuantizationType.Q8_1 : (32, 4 + 4 + 32),
+    gguf.GGMLQuantizationType.Q2_K : (256, 2 + 2 + QK_K // 16 + QK_K // 4),
+    gguf.GGMLQuantizationType.Q3_K : (256, 2 + QK_K // 4 + QK_K // 8 + 12),
+    gguf.GGMLQuantizationType.Q4_K : (256, 2 + 2 + QK_K // 2 + 12),
+    gguf.GGMLQuantizationType.Q5_K : (256, 2 + 2 + QK_K // 2 + QK_K // 8 + 12),
+    gguf.GGMLQuantizationType.Q6_K : (256, 2 + QK_K // 2 + QK_K // 4 + QK_K // 16),
+    gguf.GGMLQuantizationType.Q8_K : (256, 2 + QK_K + QK_K // 8),
+}
+
+class Hyperparameters:
+    def __init__(self):
+        self.n_vocab = self.n_embd = self.n_mult = self.n_head = self.n_layer = self.n_rot = self.ftype = 0
+
+    def load(self, data, offset):
+        (
+            self.n_vocab,
+            self.n_embd,
+            self.n_mult,
+            self.n_head,
+            self.n_layer,
+            self.n_rot,
+            self.ftype,
+        ) = struct.unpack('<7I', data[offset:offset + (4 * 7)])
+        return 4 * 7
+
+    def __str__(self):
+        return f'<Hyperparameters: n_vocab={self.n_vocab}, n_embd={self.n_embd}, n_mult={self.n_mult}, n_head={self.n_head}, n_layer={self.n_layer}, n_rot={self.n_rot}, ftype={self.ftype}>'
+
+class Vocab:
+    def __init__(self):
+        self.items = []
+
+    def load(self, data, offset, n_vocab):
+        orig_offset = offset
+        for _ in range(n_vocab):
+            itemlen = struct.unpack('<I', data[offset:offset + 4])[0]
+            assert itemlen < 4096, 'Absurd vocab item length'
+            offset += 4
+            vocab = bytes(data[offset:offset + itemlen])
+            offset += itemlen
+            score = struct.unpack('<f', data[offset:offset + 4])[0]
+            offset += 4
+            self.items.append((vocab, score))
+        return offset - orig_offset
+
+class Tensor:
+    def __init__(self):
+        self.name = None
+        self.dims = ()
+        self.dtype = None
+        self.start_offset = 0
+        self.len_bytes = 0
+
+    def load(self, data, offset):
+        orig_offset = offset
+        (n_dims, name_len, dtype) = struct.unpack('<3I', data[offset:offset + 12])
+        assert n_dims >= 0 and n_dims <= 4, f'Invalid tensor dimensions {n_dims}'
+        assert name_len < 4096, 'Absurd tensor name length'
+        quant = GGML_QUANT_SIZES.get(dtype)
+        assert quant is not None, 'Unknown tensor type'
+        (blksize, tysize) = quant
+        offset += 12
+        self.dtype= dtype
+        self.dims = struct.unpack(f'<{n_dims}I', data[offset:offset + (4 * n_dims)])
+        offset += 4 * n_dims
+        self.name = bytes(data[offset:offset + name_len])
+        offset += name_len
+        pad = ((offset + 31) & ~31) - offset
+        offset += pad
+        n_elems = np.prod(self.dims)
+        n_bytes = (n_elems * tysize) // blksize
+        self.start_offset = offset
+        self.len_bytes = n_bytes
+        offset += n_bytes
+        # print(n_dims, name_len, dtype, self.dims, self.name, pad)
+        return offset - orig_offset
+
+class GGMLV3Model:
+    def __init__(self):
+        self.hyperparameters = None
+        self.vocab = None
+        self.tensor_map = {}
+        self.tensors = []
+
+    def validate_header(self, data, offset):
+        if bytes(data[offset:offset + 4]) != b'tjgg' or struct.unpack('<I', data[offset + 4:offset + 8])[0] != 3:
+            raise ValueError('Only GGJTv3 supported')
+        return 8
+
+    def load(self, data, offset):
+        offset += self.validate_header(data, offset)
+        hp = Hyperparameters()
+        offset += hp.load(data, offset)
+        vocab = Vocab()
+        offset += vocab.load(data, offset, hp.n_vocab)
+        tensors = []
+        tensor_map = {}
+        while offset < len(data):
+            tensor = Tensor()
+            offset += tensor.load(data, offset)
+            tensor_map[tensor.name] = len(tensors)
+            tensors.append(tensor)
+        self.hyperparameters = hp
+        self.vocab = vocab
+        self.tensors = tensors
+        self.tensor_map = tensor_map
+        return offset
+
+def save_gguf(ggml_model, data, cfg):
+    hp = ggml_model.hyperparameters
+    ff_tensor_idx = ggml_model.tensor_map.get(b'layers.0.feed_forward.w1.weight')
+    assert ff_tensor_idx is not None, 'Missing layer 0 FF tensor'
+    ff_tensor = ggml_model.tensors[ff_tensor_idx]
+    if cfg.gqa == 1:
+        n_kv_head = hp.n_head
+    else:
+        gqa = float(cfg.gqa)
+        n_kv_head = None
+        for x in range(1, 256):
+            if float(hp.n_head) / float(x) == gqa:
+                n_kv_head = x
+        assert n_kv_head is not None, "Couldn't determine n_kv_head from GQA param"
+        print(f'- Guessed n_kv_head = {n_kv_head} based on GQA {cfg.gqa}')
+    nm = gguf.get_tensor_name_map(gguf.MODEL_ARCH.LLAMA, hp.n_layer)
+    gguf_writer = gguf.GGUFWriter(cfg.output, gguf.MODEL_ARCH_NAMES[gguf.MODEL_ARCH.LLAMA], use_temp_file = False)
+    #gguf_writer.add_name('meep')
+    #gguf_writer.add_source_hf_repo('merp')
+    # gguf_writer.add_tensor_data_layout("Meta AI original pth")
+    gguf_writer.add_context_length(cfg.context_length)
+    gguf_writer.add_embedding_length(hp.n_embd)
+    gguf_writer.add_block_count(hp.n_layer)
+    gguf_writer.add_feed_forward_length(ff_tensor.dims[1])
+    print('FF dim', ff_tensor.dims[1])
+    gguf_writer.add_rope_dimension_count(hp.n_embd // hp.n_head)
+    gguf_writer.add_head_count(hp.n_head)
+    gguf_writer.add_head_count_kv(n_kv_head)
+    gguf_writer.add_layer_norm_rms_eps(float(cfg.eps))
+    gguf_writer.add_tokenizer_model('llama')
+    tokens = []
+    scores = []
+    print(f'* Adding {hp.n_vocab} vocab item(s)')
+    toktypes = []
+    for (tokid, (vbytes, vscore)) in enumerate(ggml_model.vocab.items):
+        if len(vbytes) > 1 and vbytes[0] == 32:
+            vbytes = vbytes.replace(b' ', b'\xe2\x96\x81')
+        tt = 1
+        if len(vbytes) == 0:
+            tt = 3
+        elif tokid >= 3 and tokid <= 258 and len(vbytes) == 1:
+            hv = hex(vbytes[0])[2:].upper()
+            vbytes = bytes(f'<0x{hv}>', encoding = 'UTF-8')
+            tt = 6
+        toktypes.append(tt)
+        tokens.append(vbytes)
+        scores.append(vscore)
+    gguf_writer.add_token_list(tokens)
+    gguf_writer.add_token_scores(scores)
+    gguf_writer.add_token_types(toktypes)
+    print('* Adding tensors')
+    for tensor in ggml_model.tensors:
+        name = str(tensor.name, 'UTF-8')
+        if name.endswith('.weight'):
+            name = name[:-7]
+            suffix = '.weight'
+        elif name.endswith('.bias'):
+            name = name[:-5]
+            suffix = '.bias'
+        mapped_name = nm.get(name)
+        assert mapped_name is not None, f'Bad name {name}'
+        mapped_name += suffix
+        tempdims = list(tensor.dims[:])
+        if len(tempdims) > 1:
+            temp = tempdims[1]
+            tempdims[1] = tempdims[0]
+            tempdims[0] = temp
+        print(f'+ {tensor.name} | {mapped_name} {tensor.dims} :: {tempdims}')
+        gguf_writer.add_tensor(mapped_name, data[tensor.start_offset:tensor.start_offset + tensor.len_bytes], raw_shape = tempdims, raw_dtype = tensor.dtype)
+    print("gguf: write header")
+    gguf_writer.write_header_to_file()
+    print("gguf: write metadata")
+    gguf_writer.write_kv_data_to_file()
+    print("gguf: write tensors")
+    gguf_writer.write_tensors_to_file()
+
+    gguf_writer.close()
+
+def handle_args():
+    parser = argparse.ArgumentParser(description = 'Convert GGMLv3 models to GGUF')
+    parser.add_argument('--input', '-i', help = 'Input GGMLv3 filename')
+    parser.add_argument('--output', '-o', help ='Output GGUF filename')
+    parser.add_argument('--gqa', type = int, default = 1, help = 'grouped-query attention factor (use 8 for LLaMA2 70B)')
+    parser.add_argument('--eps', default = '5.0e-06', help = 'RMS norm eps (use 1e-5 for LLaMA2)')
+    parser.add_argument('--context-length', '-c', type=int, default = 2048, help = 'Default max context length')
+    return parser.parse_args()
+
+def main():
+    cfg = handle_args()
+    data = np.memmap(cfg.input, mode = 'r')
+    model = GGMLV3Model()
+    offset = model.load(data, 0)
+    print(model.hyperparameters)
+    # print(model.vocab.items)
+    # return
+    save_gguf(model, data, cfg)
+
+main()
diff --git a/gguf.py b/gguf.py
@@ -5,7 +5,7 @@
 import numpy as np
 
 from enum import IntEnum, auto
-from typing import Any, IO, List
+from typing import Any, IO, List, Optional
 
 #
 # constants
@@ -325,8 +325,20 @@ def get_tensor_name_map(arch: MODEL_ARCH, n_blocks: int) -> dict:
 
 
 class GGMLQuantizationType(IntEnum):
-    F32 = 0
-    F16 = 1
+    F32  = 0
+    F16  = 1
+    Q4_0 = 2
+    Q4_1 = 3
+    Q5_0 = 6
+    Q5_1 = 7
+    Q8_0 = 8
+    Q8_1 = 9
+    Q2_K = 10
+    Q3_K = 11
+    Q4_K = 12
+    Q5_K = 13
+    Q6_K = 14
+    Q8_K = 15
 
 
 class GGUFValueType(IntEnum):
@@ -359,7 +371,7 @@ def get_type(val):
 
 
 class GGUFWriter:
-    def __init__(self, path: str, arch: str):
+    def __init__(self, path: str, arch: str, use_temp_file = True):
         self.fout = open(path, "wb")
         self.arch = arch
         self.offset_tensor = 0
@@ -369,6 +381,8 @@ def __init__(self, path: str, arch: str):
         self.ti_data = b""
         self.ti_data_count = 0
         self.add_architecture()
+        self.use_temp_file = use_temp_file
+        self.tensors = []
 
     def write_header_to_file(self):
         self.fout.write(struct.pack("<I", GGUF_MAGIC))
@@ -476,8 +490,8 @@ def add_val(self: str, val: Any, vtype: GGUFValueType = None, add_vtype: bool =
     def ggml_pad(x: int, n: int) -> int:
         return ((x + n - 1) // n) * n
 
-    def add_tensor_info(self, name: str, tensor_shape: np.ndarray, tensor_dtype: np.dtype, tensor_nbytes: int):
-        assert tensor_dtype in (np.float32, np.float16), "Only F32 and F16 tensors are supported for now"
+    def add_tensor_info(self, name: str, tensor_shape: np.ndarray, tensor_dtype: np.dtype, tensor_nbytes: int, raw_dtype: Optional[GGMLQuantizationType] = None):
+        assert raw_dtype is not None or tensor_dtype in (np.float32, np.float16), "Only F32 and F16 tensors are supported for now"
 
         encoded_name = name.encode("utf8")
         self.ti_data += struct.pack("<I", len(encoded_name))
@@ -486,23 +500,30 @@ def add_tensor_info(self, name: str, tensor_shape: np.ndarray, tensor_dtype: np.
         self.ti_data += struct.pack("<I", n_dims)
         for i in range(n_dims):
             self.ti_data += struct.pack("<I", tensor_shape[n_dims - 1 - i])
-
-        dtype = GGMLQuantizationType.F32 if tensor_dtype == np.float32 else GGMLQuantizationType.F16
+        if raw_dtype is None:
+            dtype = GGMLQuantizationType.F32 if tensor_dtype == np.float32 else GGMLQuantizationType.F16
+        else:
+            dtype = raw_dtype
         self.ti_data += struct.pack("<I", dtype)
         self.ti_data += struct.pack("<Q", self.offset_tensor)
         self.offset_tensor += GGUFWriter.ggml_pad(tensor_nbytes, self.data_alignment)
         self.ti_data_count += 1
 
-    def add_tensor(self, name: str, tensor: np.ndarray):
-        if not hasattr(self, "temp_file"):
+    def add_tensor(self, name: str, tensor: np.ndarray, raw_shape: Optional[np.ndarray], raw_dtype: Optional[GGMLQuantizationType] = None):
+        if self.use_temp_file and not hasattr(self, "temp_file"):
             self.temp_file = tempfile.SpooledTemporaryFile(mode="w+b", max_size=256*1024*1024)
             self.temp_file.seek(0)
 
-        self.add_tensor_info(name, tensor.shape, tensor.dtype, tensor.nbytes)
+        self.add_tensor_info(name, raw_shape if raw_shape is not None else tensor.shape, tensor.dtype, tensor.nbytes, raw_dtype = raw_dtype)
+
+        pad = GGUFWriter.ggml_pad(tensor.nbytes, self.data_alignment) - tensor.nbytes
+
+        if not self.use_temp_file:
+            self.tensors.append((tensor, pad))
+            return
 
         tensor.tofile(self.temp_file)
 
-        pad = GGUFWriter.ggml_pad(tensor.nbytes, self.data_alignment) - tensor.nbytes
         if pad != 0:
             self.temp_file.write(bytes([0] * pad))
 
@@ -524,6 +545,13 @@ def write_tensors_to_file(self):
         if pad != 0:
             self.fout.write(bytes([0] * pad))
 
+        if not self.use_temp_file:
+            for (currtensor, currpad) in self.tensors:
+                currtensor.tofile(self.fout)
+                if currpad != 0:
+                    self.fout.write(bytes([0] * currpad))
+            return
+
         self.temp_file.seek(0)
 
         shutil.copyfileobj(self.temp_file, self.fout)
