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import datasets
datasets.config.DOWNLOADED_DATASETS_PATH = "/mnt/jeff/huggingface/data"
import os
os.environ['HF_HOME'] = '/mnt/jeff/huggingface'

import argparse
import json
import os
from pathlib import Path

import numpy as np
import torch
import sacrebleu

from datasets import load_dataset
from torch.utils.data import Dataset, ConcatDataset
from tqdm import tqdm
from transformers import (
    AutoProcessor,
    AutoModel,
    BatchFeature,
    Trainer,
    TrainingArguments,
    StoppingCriteria,
    StoppingCriteriaList,
)
from collections import defaultdict

import soundfile as sf
from datasets import Audio
import random
from ASRDataset import *


def count_parameters_by_module(model):
    # dictionary for parameters number by modules
    module_params = defaultdict(lambda: {"total": 0, "trainable": 0})
    
    # all params
    total_params = 0
    total_trainable_params = 0
    
    # Check Embedding Token masks
    embedding_masks = {}
    for name, param in model.named_parameters():
        if 'embed_tokens.weight' in name and hasattr(param, '_backward_hooks') and param._backward_hooks:
            # check if params has embedding_grad_mask_hook
            for hook_id, hook_fn in param._backward_hooks.items():
                if hook_fn.__code__.co_name == 'embedding_grad_mask_hook':
                    # Accessing mask variables in the closure of hook functions
                    for cell in hook_fn.__closure__ or []:
                        if isinstance(cell.cell_contents, torch.Tensor) and cell.cell_contents.dtype == torch.bool:
                            # check mask tensor
                            embedding_masks[name] = ~cell.cell_contents  # True : Trainable
                 
    # Count params by modules
    for name, param in model.named_parameters():
        # extracts top module_name
        module_name = name.split('.')[0]
        param_count = param.numel()
        
        module_params[module_name]["total"] += param_count
        total_params += param_count
        
        if param.requires_grad:
            # Only count for real trainable params. (with masks)
            if name in embedding_masks:
                trainable_count = embedding_masks[name].sum().item()
                module_params[module_name]["trainable"] += trainable_count
                total_trainable_params += trainable_count
            else:
                module_params[module_name]["trainable"] += param_count
                total_trainable_params += param_count
    
    print(f"All Params: {total_params:,}")
    print(f"Trainable Params: {total_trainable_params:,} ({total_trainable_params/total_params*100:.2f}%)")
    print("\nParams by Module:")
    
    for module_name, counts in sorted(module_params.items()):
        trainable_percentage = counts["trainable"] / counts["total"] * 100 if counts["total"] > 0 else 0
        total_percentage = counts["total"] / total_params * 100
        
        print(f"- {module_name}:")
        print(f"  Total: {counts['total']:,} ({total_percentage:.2f}% of model)")
        print(f"  Trainable: {counts['trainable']:,} ({trainable_percentage:.2f}% of module)")
    
    return module_params

def create_model(model_name_or_path, revision="main", use_flash_attention = False):
    model = AutoModel.from_pretrained(
        model_name_or_path,
        revision=revision,
        torch_dtype=torch.bfloat16,
        device_map="auto",
        attn_implementation="flash_attention_2" if use_flash_attention else "eager",
        trust_remote_code=True,
    )
    
    # Set use_cache to False after model loaded
    model.config.use_cache = False

    # Freeze all parameters
    for param in model.parameters():
        param.requires_grad = False
    
    model.set_lora_adapter('speech')
    # model.set_lora_adapter('text')
    model.to(torch.bfloat16)
    
    # (Optional) unfreeze audio_tower parameters
    # for param in model.audio_tower.parameters():
    #    param.requires_grad = True

    # Only unfreeze audio_projector parameters
    # for param in model.audio_projector.parameters():
    #     param.requires_grad = True

    # (Optional) unfreeze audio embed_tokens
    train_embed = True
    if train_embed:
        embed_tokens = model.language_model.model.model.embed_tokens
        
        embed_tokens.weight.requires_grad = False

        # Added Speech token IDs (only this tokens be trainable)
        trainable_token_ids = [256001, 256002]

        embed_tokens.weight.requires_grad = True
        mask = torch.ones_like(embed_tokens.weight, dtype=torch.bool)
        mask[trainable_token_ids] = False  # Trainable Tokens are False (unfreeze), else True (freeze)

        # backward hook, with gradient masking
        def embedding_grad_mask_hook(grad):
            return grad.masked_fill(mask, 0)

        embed_tokens.weight.register_hook(embedding_grad_mask_hook)

        model.language_model.model.model.embed_tokens = embed_tokens
        
    count_parameters_by_module(model)

    return model

ANSWER_SUFFIX = "<end_of_turn>"
_IGNORE_INDEX = -100

ANSWER_SUFFIX = "<end_of_turn>"
_IGNORE_INDEX = -100

model_name_or_path = '/mnt/jeff/gemma-3-4b-it-omni'
use_flash_attention = False

output_dir = '../gemma_tmp14_audio_and_text_speechlora'
batch_size = 16
batch_size_per_gpu = 1
learning_rate = 5.0e-5 # 1.0e-4 for fine-tuning
wd = 0.01
num_train_epochs = 10

revision = "main" #"v1.0"

processor = AutoProcessor.from_pretrained(
    model_name_or_path,
    revision=revision,
    trust_remote_code=True,
)

model = create_model(
    model_name_or_path,
    revision=revision,
    use_flash_attention=use_flash_attention,
)

train_datasets = []

pickup_dataset = MultiturnAudioDataset(processor=processor,text_only=True,json_path='/mnt/jeff/InCar/data/multiturn_data/pickup_processed.json')
train_datasets.append(pickup_dataset)

pickup_dataset = MultiturnAudioDataset(processor=processor,json_path='/mnt/jeff/InCar/data/multiturn_data/pickup_processed.json')
train_datasets.append(pickup_dataset)

# custom_tw_loc = TWCostumData(processor=processor,
#                       csv_path='/mnt/jeff/InCar/data/tw_data/taiwan_location-srdc_tts-20250509-common_voice_16_1-TW.csv')
# train_datasets.append(custom_tw_loc) # 1500

# custom_tw_loc2 = TWCostumData(processor=processor,
#                       csv_path='/mnt/jeff/InCar/data/tw_data/taiwan_location-srdc_tts-20250529-common_voice_16_1-TW.csv')
# train_datasets.append(custom_tw_loc2) # 9458

# custom_yating_tw_road = TWCostumData(processor=processor,
#                       csv_path='/mnt/jeff/InCar/data/tw_data/taiwan_road-srdc_tts-20250430-yating-1-2s-breezyvoice.csv')
# train_datasets.append(custom_yating_tw_road) # 35224

# custom_tw_road = TWCostumData(processor=processor,
#                       csv_path='/mnt/jeff/InCar/data/tw_data/taiwan_road-srdc_tts-20250509-common_voice_16_1-TW.csv')
# train_datasets.append(custom_tw_road) # 1500

# custom_tw_road2 = TWCostumData(processor=processor,
#                       csv_path='/mnt/jeff/InCar/data/tw_data/taiwan_road-srdc_tts-20250529-common_voice_16_1-TW.csv')
# train_datasets.append(custom_tw_road2) # 35224



print("Count Num of Datasets", len(train_datasets))
print([len(dataset) for dataset in train_datasets])

# ConcatDataset
train_dataset = ConcatDataset(train_datasets) if len(train_datasets) > 1 else train_datasets[0]
print("Count Length of Datas", len(train_dataset))



# Check GPUs
num_gpus = torch.cuda.device_count()
print(f'training on {num_gpus} GPUs')

assert (
    batch_size % (num_gpus * batch_size_per_gpu) == 0
), 'Batch size must be divisible by the number of GPUs'
gradient_accumulation_steps = batch_size // (num_gpus * batch_size_per_gpu)

# hard coded training args
dp_config = {
    "fp16": {
      "enabled": "auto",
      "loss_scale": 0,
      "loss_scale_window": 1000,
      "initial_scale_power": 16,
      "hysteresis": 2,
      "min_loss_scale": 1
  },
   "zero_optimization": {
       "stage": 2,
       "allgather_partitions": True,
       "allgather_bucket_size": 5e8,
       "overlap_comm": False,
       "reduce_scatter": True,
       "reduce_bucket_size": 5e8,
       "contiguous_gradients": True,
       "cpu_offload": True
   },

   "train_batch_size": "auto",
    "gradient_accumulation_steps": "auto",
    "optimizer": {
        "type": "AdamW",
        "params": {
          "lr": "auto",
          "betas": 'auto',
          "eps": 'auto',
          "weight_decay": "auto"
        }
    },
    "scheduler": {
      "type": "WarmupDecayLR",
      "params": {
          "warmup_min_lr": "auto",
          "warmup_max_lr": "auto",
          "warmup_num_steps": "auto",
          "total_num_steps": "auto"
      }
  },
    "gradient_clipping": 1.0,
    "zero_optimization": {
        "stage": 0
    }
}
training_args = TrainingArguments(
    num_train_epochs=num_train_epochs,
    per_device_train_batch_size=batch_size_per_gpu,
    gradient_checkpointing=True,
    gradient_checkpointing_kwargs={'use_reentrant': False},
    gradient_accumulation_steps=gradient_accumulation_steps,
    optim='adamw_torch',
    adam_beta1=0.9,
    adam_beta2=0.95,
    adam_epsilon=1e-7,
    learning_rate=learning_rate,
    weight_decay=wd,
    max_grad_norm=1.0,
    lr_scheduler_type='cosine',
    warmup_steps=50,
    logging_steps=10,
    output_dir=output_dir,
    save_total_limit=10,
    save_only_model=True,
    bf16=True,
    fp16=False,
    remove_unused_columns=False,
    report_to='none',
    deepspeed=None,
    disable_tqdm=False,
    dataloader_num_workers=16,
    save_strategy='epoch',
    # save_steps=2500,
    ddp_find_unused_parameters=True,

)

out_path = Path(training_args.output_dir)
out_path.mkdir(parents=True, exist_ok=True)

# create optimizer only for trainable params
optimizer = torch.optim.AdamW(
    filter(lambda p: p.requires_grad, model.parameters()),
    lr=learning_rate,
    weight_decay=wd,
    betas=(0.9, 0.95),
    eps=1e-7,
)

# Trainer Setting
trainer = Trainer(
    model=model,
    args=training_args,
    data_collator=covost_collate_fn,
    train_dataset=train_dataset,
    optimizers=(optimizer, None)
)

trainer.train()


# # 1. Save LoRA Adapter
model.language_model.model.save_pretrained(output_dir)

# # 1-1. Delete Markdown file
# markdown_file = os.path.join(output_dir, "README.md")
# if os.path.exists(markdown_file):
#     os.remove(markdown_file)

# 2. Save entire model
model.save_pretrained(output_dir)