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import torch
torch.backends.cuda.matmul.allow_tf32 = True
import random
from transformers import AutoTokenizer, AutoModelForCausalLM
from datasets import load_dataset
from transformers import TrainingArguments
from trl import SFTTrainer
from peft import LoraConfig

import time
random_seed = 42
torch.manual_seed(random_seed)
random.seed(random_seed)

dataset = load_dataset("HuggingFaceH4/deita-10k-v0-sft", split="train_sft")

n_ahead_talk_global = 2
n_passes_global = 2
n_ahead_global = 2
n_examples = 0
full_batch_size = 2
eval_and_logging_steps = 2
save_steps = 100


def model_init(params):
    original = False
    if params is None:
        params = {}
    else:
        params = params.params
    # save params to file
    n_ahead = params.get("n_ahead", n_ahead_global if not original else 1)
    n_ahead_talk = params.get("n_ahead_talk", n_ahead_talk_global if not original else 1)
    n_passes = params.get("n_passes", n_passes_global if not original else 1)
    gumbel_temperature = params.get("gumbel_temperature", 1)
    use_start_thought_token = params.get("use_start_thought_token", True)
    use_end_thought_token = params.get("use_end_thought_token", True)
    include_policy_loss = params.get("include_policy_loss", True)
    gumbel_detach = params.get("gumbel_detach", True)
    merged_talk_heads = params.get("merged_talk_heads", True)
    gradient_accumulation_steps = params.get("gradient_accumulation_steps", global_gradient_accumulation_steps)
    residual_think_head = params.get("residual_think_head", False)
    optimize_lm_head_only_at_start = params.get("optimize_lm_head_only_at_start", False)

    model_id = "Crystalcareai/Quiet-Star-Custom"
    tokenizer_id = model_id
    print("Loading model")
    model = AutoModelForCausalLM.from_pretrained(
        model_id,
        torch_dtype=torch.float16 if torch.cuda.is_available() else torch.float32,
        max_thoughts=n_ahead + n_ahead_talk + 1,
        merged_talk_heads=merged_talk_heads,
        merged_lm_and_talk_heads=False,
        merged_lm_and_think_heads=True,
        use_concat_talk_head=True,
        use_shallow_think=True,
        use_shallow_talk=False,
        use_complex_think_head=False,
        use_complex_talk_head=True,
        use_weighted_talk_head=True,
        trust_remote_code=True,  
        device_map="auto",
    )
    print("Loaded model")
   
    tokenizer = AutoTokenizer.from_pretrained(tokenizer_id,padding=False,truncation=True)
    tokenizer.pad_token_id = tokenizer.eos_token_id

    special_tokens_to_add = []
    if model.use_start_thought_token:
        special_tokens_to_add.append("<|startthought|>")
    if model.use_end_thought_token:
        special_tokens_to_add.append("<|endthought|>")
    if special_tokens_to_add:
        tokenizer.add_special_tokens({"additional_special_tokens": special_tokens_to_add})
        model.resize_token_embeddings(len(tokenizer))
    model.tokenizer = tokenizer
    model.gumbel_detach = gumbel_detach
    model.include_policy_loss = include_policy_loss
    model.use_end_thought_token = use_end_thought_token
    model.use_start_thought_token = use_start_thought_token
    model.n_ahead = n_ahead
    model.n_ahead_talk = n_ahead_talk
    model.n_passes = n_passes
    model.n_tokens_print = gradient_accumulation_steps
    model.gradient_accumulation_steps = gradient_accumulation_steps
    model.residual_think_head = residual_think_head
    model.optimize_lm_head_only_at_start = optimize_lm_head_only_at_start
    model.gumbel_temperature = gumbel_temperature
    model.original_mode = original
    model.config_params = params
    model.run_start = int(time.time())
    model.kill_after = 100
    model.train()
    return model


batch_size = full_batch_size // n_passes_global
global_gradient_accumulation_steps = full_batch_size // batch_size
run_id = int(time.time())
training_args = TrainingArguments(
    output_dir="./out",
    num_train_epochs=3,
    per_device_train_batch_size=1,
    gradient_checkpointing=False,
    gradient_accumulation_steps=4,
    optim="adamw_torch_fused",
    logging_steps=1,
    save_strategy="steps",
    save_steps=300,
    bf16=True,
    tf32=False,
    # auto_find_batch_size=True
    learning_rate=2e-07,
    max_grad_norm=1.0,  # Gradient clipping with a maximum gradient norm of 0.3
    warmup_steps=100,
    lr_scheduler_type="cosine",
    push_to_hub=False,
)

# peft_config = LoraConfig(
#           r = 16, # Choose any number > 0 ! Suggested 8, 16, 32, 64, 128
#     target_modules = ["q_proj", "k_proj", "v_proj", "o_proj",
#                       "gate_proj", "up_proj", "down_proj",],
#     lora_alpha = 16,
#     lora_dropout = 0, # Supports any, but = 0 is optimized
#     bias = "none", # Enable Dora method
#     use_dora=True,
# )

torch.autograd.set_detect_anomaly(True)
model = model_init(None)  # Initialize the model
tokenizer = model.tokenizer  

trainer = SFTTrainer(
    args=training_args,
    train_dataset=dataset,
    model=model,
    # peft_config=peft_config,
    tokenizer=tokenizer,  
)

trainer.train()