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# Convert a LLaMA model checkpoint to a ggml compatible file
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#
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# Load the model using Torch
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# Iterate over all variables and write them to a binary file.
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#
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# For each variable, write the following:
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# - Number of dimensions (int)
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# - Name length (int)
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# - Dimensions (int[n_dims])
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# - Name (char[name_length])
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# - Data (float[n_dims])
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#
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# By default, the bigger matrices are converted to 16-bit floats.
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# This can be disabled by adding the "use-f32" CLI argument.
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#
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# At the start of the ggml file we write the model parameters
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# and vocabulary.
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#
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import sys
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import json
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import struct
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import numpy as np
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import torch
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import argparse
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from sentencepiece import SentencePieceProcessor
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ARG_PARSER = argparse.ArgumentParser()
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ARG_PARSER.add_argument("--model",
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type=str,
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required=True,
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help="Model to convert")
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ARG_PARSER.add_argument("--ftype",
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type=str,
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required=True,
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choices=["f16", "f32"],
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help="Either f16 or f32")
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ARG_PARSER.add_argument("--output",
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type=str,
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required=True,
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help="Model to write")
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ARGS = ARG_PARSER.parse_args()
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FTYPE_IDX = {"f16": 1, "f32": 0}[ARGS.ftype]
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fname_hparams = ARGS.model + "/params.json"
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fname_tokenizer = ARGS.model + "/../tokenizer.model"
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def get_n_parts(dim):
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if dim == 4096:
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return 1
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elif dim == 5120:
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return 2
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elif dim == 6656:
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return 4
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elif dim == 8192:
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return 8
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else:
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print("Invalid dim: " + str(dim))
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sys.exit(1)
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fname_out = ARGS.output + "/ggml-model-" + ARGS.ftype + ".bin"
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with open(fname_hparams, "r") as f:
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hparams = json.load(f)
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tokenizer = SentencePieceProcessor(fname_tokenizer)
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hparams.update({"vocab_size": tokenizer.vocab_size()})
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n_parts = get_n_parts(hparams["dim"])
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print(hparams)
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print('n_parts = ', n_parts)
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for p in range(n_parts):
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print('Processing part ', p)
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fname_out = ARGS.output + "/ggml-model-" + ARGS.ftype + ".bin"
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if (p > 0):
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fname_out = ARGS.output + "/ggml-model-" + ARGS.ftype + ".bin" + "." + str(p)
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model = torch.load(
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ARGS.model + "/consolidated.0" + str(p) + ".pth", map_location="cpu"
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)
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fout = open(fname_out, "wb")
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fout.write(struct.pack("i", 0x67676d6c)) # magic: ggml in hex
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fout.write(struct.pack("i", hparams["vocab_size"]))
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fout.write(struct.pack("i", hparams["dim"]))
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fout.write(struct.pack("i", hparams["multiple_of"]))
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fout.write(struct.pack("i", hparams["n_heads"]))
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fout.write(struct.pack("i", hparams["n_layers"]))
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fout.write(struct.pack("i", hparams["dim"] // hparams["n_heads"])) # rot (obsolete)
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fout.write(struct.pack("i", FTYPE_IDX))
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# Is this correct??
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for i in range(32000):
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# TODO: this is probably wrong - not sure how this tokenizer works
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text = tokenizer.decode([29889, i]).encode('utf-8')
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# remove the first byte (it's always '.')
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text = text[1:]
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fout.write(struct.pack("i", len(text)))
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fout.write(text)
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for k, v in model.items():
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name = k
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shape = v.shape
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# skip layers.X.attention.inner_attention.rope.freqs
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if name[-5:] == "freqs":
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continue
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print("Processing variable: " + name + " with shape: ", shape, " and type: ", v.dtype)
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#data = tf.train.load_variable(ARGS.output, name).squeeze()
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data = v.numpy().squeeze()
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n_dims = len(data.shape);
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# for efficiency - transpose some matrices
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# "model/h.*/attn/c_attn/w"
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# "model/h.*/attn/c_proj/w"
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# "model/h.*/mlp/c_fc/w"
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# "model/h.*/mlp/c_proj/w"
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#if name[-14:] == "/attn/c_attn/w" or \
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# name[-14:] == "/attn/c_proj/w" or \
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# name[-11:] == "/mlp/c_fc/w" or \
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# name[-13:] == "/mlp/c_proj/w":
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# print(" Transposing")
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# data = data.transpose()
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dshape = data.shape
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if ARGS.ftype == "f32" or n_dims == 1:
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print(" Converting to float32")
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data = data.astype(np.float32)
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# header
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sname = name.encode('utf-8')
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fout.write(struct.pack("iii", n_dims, len(sname), FTYPE_IDX))
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for i in range(n_dims):
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fout.write(struct.pack("i", dshape[n_dims - 1 - i]))
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fout.write(sname);
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# data
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data.tofile(fout)
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# I hope this deallocates the memory ..
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model = None
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fout.close()
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print("Done. Output file: " + fname_out + ", (part ", p, ")")
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print("")
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