convert_hf_to_scm.py

import glob
import re
import shutil
import sys

import accelerate
import torch
from configuration_glm4_moe_lite_scm import Glm4MoeLiteSCMConfig
from modeling_glm4_moe_lite_scm import Glm4MoeLiteSCMForCausalLM
from transformers.models.glm4_moe_lite.configuration_glm4_moe_lite import Glm4MoeLiteConfig
from safetensors import safe_open

input_model = sys.argv[1]
output_model_path = sys.argv[2]

auto_map = {
    "AutoConfig": "configuration_glm4_moe_lite_scm.Glm4MoeLiteSCMConfig",
    "AutoModel": "modeling_glm4_moe_lite_scm.Glm4MoeLiteSCMModel",
    "AutoModelForCausalLM": "modeling_glm4_moe_lite_scm.Glm4MoeLiteSCMForCausalLM"
},

cfg_standard_moe = Glm4MoeLiteConfig.from_pretrained(input_model)
cfg_shared_moe = Glm4MoeLiteSCMConfig(
    auto_map=auto_map,
    n_group=cfg_standard_moe.n_group,
    topk_group=cfg_standard_moe.topk_group,
    n_shared_experts=cfg_standard_moe.n_shared_experts,
    n_routed_experts=cfg_standard_moe.n_routed_experts,
    num_experts_per_tok=cfg_standard_moe.num_experts_per_tok,
    first_k_dense_replace=cfg_standard_moe.first_k_dense_replace,
    vocab_size=cfg_standard_moe.vocab_size,
    hidden_size=cfg_standard_moe.hidden_size,
    intermediate_size=cfg_standard_moe.intermediate_size,
    num_hidden_layers=cfg_standard_moe.num_hidden_layers,
    num_attention_heads=cfg_standard_moe.num_attention_heads,
    num_key_value_heads=cfg_standard_moe.num_key_value_heads,
    hidden_act=cfg_standard_moe.hidden_act,
    max_position_embeddings=cfg_standard_moe.max_position_embeddings,
    initializer_range=cfg_standard_moe.initializer_range,
    rms_norm_eps=cfg_standard_moe.rms_norm_eps,
    tie_word_embeddings=cfg_standard_moe.tie_word_embeddings,
    rope_parameters=cfg_standard_moe.rope_parameters,
    rope_scaling=cfg_standard_moe.rope_scaling,
    attention_dropout=cfg_standard_moe.attention_dropout,
    moe_intermediate_size=cfg_standard_moe.moe_intermediate_size,
    qk_nope_head_dim=cfg_standard_moe.qk_nope_head_dim,
    qk_rope_head_dim=cfg_standard_moe.qk_rope_head_dim,
    v_head_dim=cfg_standard_moe.v_head_dim,
    partial_rotary_factor=cfg_standard_moe.partial_rotary_factor,
    num_nextn_predict_layers=0,
    routed_scaling_factor=cfg_standard_moe.routed_scaling_factor,
    topk_method=cfg_standard_moe.topk_method,
    norm_topk_prob=cfg_standard_moe.norm_topk_prob,
    attention_bias=cfg_standard_moe.attention_bias,
    q_lora_rank=cfg_standard_moe.q_lora_rank,
    kv_lora_rank=cfg_standard_moe.kv_lora_rank,
    eos_token_id=cfg_standard_moe.eos_token_id,
    pad_token_id=cfg_standard_moe.pad_token_id,
    torch_dtype=cfg_standard_moe.torch_dtype,
)

num_experts = cfg_standard_moe.n_routed_experts
num_hidden_layers = cfg_standard_moe.num_hidden_layers

with accelerate.init_empty_weights():
    model_shared_moe = Glm4MoeLiteSCMForCausalLM(cfg_shared_moe)

model_shared_moe = model_shared_moe.to(torch.bfloat16)
new_state_dict = {}
pattern = f"{input_model}/model-*-of-*.safetensors"
files = sorted(glob.glob(pattern))

if len(files) == 0:
    raise FileNotFoundError
tensors = {}

for file_path in files:
    print(f"processing {file_path}")
    with safe_open(file_path, framework="pt", device="cpu") as f:
        for key in f.keys():
            tensor = f.get_tensor(key)
            tensors[key] = tensor

for key in tensors:
    if f"layers.{num_hidden_layers}" in key:
        continue
    if "experts" not in key or "shared_experts" in key:
        new_state_dict[key] = tensors[key]
    elif "experts.0" in key:
        layer_num = int(re.search(r"\d+", key).group())
        new_state_dict[
            f"model.layers.{layer_num}.mlp.moe_mlp.output_experts.weight"
        ] = torch.stack(
            [
                tensors[f"model.layers.{layer_num}.mlp.experts.{i}.down_proj.weight"]
                for i in range(num_experts)
            ]
        )
        new_state_dict[f"model.layers.{layer_num}.mlp.moe_mlp.experts.weight"] = (
            torch.stack(
                [
                    torch.cat(
                        [
                            tensors[
                                f"model.layers.{layer_num}.mlp.experts.{i}.up_proj.weight"
                            ],
                            tensors[
                                f"model.layers.{layer_num}.mlp.experts.{i}.gate_proj.weight"
                            ],
                        ],
                        dim=0,
                    )
                    for i in range(num_experts)
                ]
            )
        )
model_shared_moe.load_state_dict(new_state_dict, strict=True, assign=True)
model_shared_moe.save_pretrained(output_model_path)
cfg_shared_moe.save_pretrained(output_model_path)


shutil.copy(
    "modeling_glm4_moe_lite_scm.py",
    output_model_path + "/" + "modeling_glm4_moe_lite_scm.py",
)
shutil.copy(
    "configuration_glm4_moe_lite_scm.py",
    output_model_path + "/" + "configuration_glm4_moe_lite_scm.py",
)
for i in ["tokenizer_config.json", "tokenizer.json", "chat_template.jinja"]:
    shutil.copy(input_model + "/" + i, output_model_path + "/" + i)