# Quick and dirty HF gptneox--> gguf conversion

import gguf
import sys
import struct
import json
import numpy as np
from typing import Any, List
from pathlib import Path
from transformers import AutoModelForCausalLM


if len(sys.argv) < 3:
    print("Usage: convert-h5-to-ggml.py dir-model ftype\n")
    print("  ftype == 0 -> float32")
    print("  ftype == 1 -> float16")
    sys.exit(1)


# output in the same directory as the model
dir_model = sys.argv[1]
fname_out = sys.argv[1] + "/ggml-model.bin"


# possible tensor data types
#   ftype == 0 -> float32
#   ftype == 1 -> float16
#
# map from ftype to string
ftype_str = ["f32", "f16"]

ftype = 1
if len(sys.argv) > 2:
    ftype = int(sys.argv[2])
    if ftype < 0 or ftype > 1:
        print("Invalid ftype: " + str(ftype))
        sys.exit(1)
    fname_out = sys.argv[1] + "/ggml-model-" + ftype_str[ftype] + ".gguf"

with open(dir_model + "/config.json", "r", encoding="utf-8") as f:
    hparams = json.load(f)

if hparams["architectures"][0] != "GPTNeoXForCausalLM":
    print("Model architecture not supported: " + hparams["architectures"][0] )
    sys.exit()

model = AutoModelForCausalLM.from_pretrained(dir_model, low_cpu_mem_usage=True, trust_remote_code=True)
list_vars = model.state_dict()

gguf_writer = gguf.GGUFWriter.open(fname_out)


print("gguf: add key-values, metadata")

llm_arch = "gptneox"

gguf_writer.add_name("pythia-70b-deduped")
gguf_writer.add_description("gguf test model")
gguf_writer.add_architecture(llm_arch)
gguf_writer.add_context_length(llm_arch, hparams["max_position_embeddings"])
gguf_writer.add_embedding_length(llm_arch, hparams["hidden_size"])
gguf_writer.add_layer_count(llm_arch, hparams["num_hidden_layers"])
gguf_writer.add_feed_forward_length(llm_arch, hparams["intermediate_size"])
gguf_writer.add_rope_dimension_count(llm_arch, int( hparams["rotary_pct"]*(hparams["hidden_size"]//hparams["num_attention_heads"])) )
gguf_writer.add_head_count(llm_arch, hparams["num_attention_heads"])
gguf_writer.add_parallel_residual(llm_arch, hparams["use_parallel_residual"] if "use_parallel_residual" in hparams else True)
gguf_writer.add_layer_norm_eps(llm_arch, hparams["layer_norm_eps"])

# TOKENIZATION

print("gguf: add key-values, tokenizer")

tokens: List[str] = []
merges: List[str] = []

if Path(dir_model + "/tokenizer.json").is_file():
    # vocab type gpt2
    print("gguf: adding gpt2 tokenizer vocab")

    with open(dir_model + "/tokenizer.json", "r", encoding="utf-8") as f:
        tokenizer = json.load(f)

    for key in tokenizer["model"]["vocab"]:
        tokens.append(key)

    merges = tokenizer["model"]["merges"]

    gguf_writer.add_tokenizer_model("gpt2")
    gguf_writer.add_token_list(tokens)
    gguf_writer.add_token_merges(merges)

    if "added_tokens" in tokenizer and Path(dir_model + "/tokenizer_config.json").is_file():
        print("gguf: adding special token ids")

        with open(dir_model + "/tokenizer_config.json", "r", encoding="utf-8") as f:
            tokenizer_config = json.load(f)

        # find special token ids

        if "bos_token" in tokenizer_config:
            for key in tokenizer["added_tokens"]:
                if key["content"] == tokenizer_config["bos_token"]:
                    gguf_writer.add_bos_token_id(key["id"])

        if "eos_token" in tokenizer_config:
            for key in tokenizer["added_tokens"]:
                if key["content"] == tokenizer_config["eos_token"]:
                    gguf_writer.add_eos_token_id(key["id"])

        if "unk_token" in tokenizer_config:
            for key in tokenizer["added_tokens"]:
                if key["content"] == tokenizer_config["unk_token"]:
                    gguf_writer.add_unk_token_id(key["id"])

        if "sep_token" in tokenizer_config:
            for key in tokenizer["added_tokens"]:
                if key["content"] == tokenizer_config["sep_token"]:
                    gguf_writer.add_sep_token_id(key["id"])

        if "pad_token" in tokenizer_config:
            for key in tokenizer["added_tokens"]:
                if key["content"] == tokenizer_config["pad_token"]:
                    gguf_writer.add_pad_token_id(key["id"])


# TENSORS

# tensor info
print("gguf: add gguf tensor info")

for name in list_vars.keys():
    data = list_vars[name].squeeze().numpy()

    # we don't need these
    if name.endswith(".attention.masked_bias") or name.endswith(".attention.bias") or name.endswith(".attention.rotary_emb.inv_freq"):
        continue

    n_dims = len(data.shape)

    # ftype == 0 -> float32, ftype == 1 -> float16
    ftype_cur = 0
    if ftype != 0:
        if name.endswith(".weight") and n_dims == 2:
            data = data.astype(np.float16)
            ftype_cur = 1
        else:
            data = data.astype(np.float32)
            ftype_cur = 0
    else:
        if data.dtype != np.float32:
            data = data.astype(np.float32)
            ftype_cur = 0

    gguf_writer.add_tensor_info(name, data)

print("gguf: write header")
gguf_writer.write_header_to_file()
print("gguf: write key-values")
gguf_writer.write_kv_data_to_file()
print("gguf: write tensor info")
gguf_writer.write_ti_data_to_file()

# tensor data
print("gguf: write tensor data")

for name in list_vars.keys():
    data = list_vars[name].squeeze().numpy()
#    print("Process tensor: " + name + " with shape: ", data.shape)

    # we don't need these
    if name.endswith(".attention.masked_bias") or name.endswith(".attention.bias") or name.endswith(".attention.rotary_emb.inv_freq"):
#        print("  Skip tensor: " + name)
        continue

    n_dims = len(data.shape)

    # ftype == 0 -> float32, ftype == 1 -> float16
    ftype_cur = 0
    if ftype != 0:
        if name.endswith(".weight") and n_dims == 2:
#            print("  Converting to float16")
            data = data.astype(np.float16)
            ftype_cur = 1
        else:
#            print("  Converting to float32")
            data = data.astype(np.float32)
            ftype_cur = 0
    else:
        if data.dtype != np.float32:
#            print("  Converting to float32")
            data = data.astype(np.float32)
            ftype_cur = 0

    gguf_writer.write_tensor_to_file(data)

gguf_writer.close()


print("gguf: conversion done, output file: " + fname_out)
print("")