Mo_jax.py

# TPU 최적화 Flax + JAX ReLM
import os, math, numpy as np, sentencepiece as spm, requests, tqdm
from functools import partial
from typing import Any
import jax, jax.numpy as jnp
from jax import random
from flax import linen as nn
from flax.training import train_state, checkpoints
import optax
import requests

def download_file(url, save_path):
    r = requests.get(url, stream=True)
    r.raise_for_status()
    with open(save_path, "wb") as f:
        for chunk in r.iter_content(8192*2):
            f.write(chunk)
    print(f"✅ {save_path} 저장됨")
# ------------------
# Config
# ------------------
SEQ_LEN = 512
GLOBAL_BATCH = 256
LIMIT = 200_000
VOCAB_MODEL = "ko_unigram.model"
CORPUS_PATH = "corpus.txt"
SEED = 42
LEARNING_RATE = 1e-4
EPOCHS = 1

if not os.path.exists(CORPUS_PATH):
    download_file(
        "https://huggingface.co/datasets/Yuchan5386/Prototype/resolve/main/corpus_ko.txt?download=true",
        CORPUS_PATH
    )

if not os.path.exists(VOCAB_MODEL):
    download_file(
        "https://huggingface.co/Yuchan5386/inlam-100m/resolve/main/ko_unigram.model?download=true",
        VOCAB_MODEL
    )

DTYPE = jnp.bfloat16 if jax.local_devices()[0].platform == "tpu" else jnp.float32
NUM_DEVICES = jax.device_count()
PER_DEVICE_BATCH = GLOBAL_BATCH // NUM_DEVICES
print("devices:", jax.devices(), "dtype:", DTYPE)

# ------------------
# Tokenizer
# ------------------
sp = spm.SentencePieceProcessor()
sp.load(VOCAB_MODEL)
pad_id = sp.piece_to_id("<pad>") if sp.piece_to_id("<pad>")!=-1 else 0
start_id = sp.piece_to_id("<start>")
end_id = sp.piece_to_id("<end>")
vocab_size = sp.get_piece_size()
print("vocab_size:", vocab_size, "pad_id:", pad_id, "start_id:", start_id, "end_id:", end_id)

# ------------------
# Data pipeline
# ------------------
def line_to_ids(line, max_len=SEQ_LEN):
    ids = sp.encode(line.strip(), out_type=int)
    if len(ids) > max_len-1: ids = ids[:max_len-1]
    ids += [end_id] + [pad_id]*(max_len-len(ids)-1)
    return np.array(ids, dtype=np.int32)

def build_dataset(corpus_path, limit=LIMIT):
    arr = []
    with open(corpus_path, "r", encoding="utf-8") as f:
        for i, line in enumerate(f):
            if i>=limit: break
            line=line.strip()
            if not line: continue
            arr.append(line_to_ids(line))
    data = np.stack(arr, axis=0)
    print("Loaded dataset:", data.shape)
    return data

data_np = build_dataset(CORPUS_PATH, LIMIT)
inputs = data_np
targets = np.concatenate([data_np[:,1:], np.full((data_np.shape[0],1), pad_id, np.int32)], axis=1)

def create_batch_iter(inputs, targets, batch_size, rng):
    idx = np.arange(inputs.shape[0]); rng.shuffle(idx)
    for i in range(0,len(idx)-batch_size+1,batch_size):
        batch_idx = idx[i:i+batch_size]
        yield inputs[batch_idx], targets[batch_idx]

def shard(xs): return xs.reshape(NUM_DEVICES, -1, xs.shape[1])

# ------------------
# Model
# ------------------
class SwiGLU(nn.Module):
    d_model: int
    dtype: Any = DTYPE
    @nn.compact
    def __call__(self,x):
        proj = nn.Dense(self.d_model*2,dtype=self.dtype)(x)
        x_val, x_gate = jnp.split(proj,2,-1)
        out = x_val * nn.silu(x_gate)
        return nn.Dense(self.d_model,dtype=self.dtype)(out)

class LoU(nn.Module):
    d_model:int
    dtype:Any=DTYPE
    @nn.compact
    def __call__(self,x):
        residual = x
        x_norm = nn.LayerNorm(epsilon=1e-5,dtype=self.dtype)(x)
        Q=nn.Dense(self.d_model,dtype=self.dtype)
        K=nn.Dense(self.d_model,dtype=self.dtype)
        V=nn.Dense(self.d_model,dtype=self.dtype)
        q,k,v = Q(x_norm),K(x_norm),V(x_norm)
        g_q = (jnp.tanh(q)+1)/2; g_k=(jnp.tanh(k)+1)/2
        score = g_q*g_k
        alpha_dynamic = nn.Dense(1,dtype=self.dtype)(x_norm)
        # EMA scan along seq axis
        score_t = jnp.transpose(score,(1,0,2))
        alpha_t = jnp.transpose(alpha_dynamic,(1,0,2))
        def step(prev,cur): s,a=cur; new=a*s+(1-a)*prev; return new,new
        init = score_t[0]; _,ema_seq=jax.lax.scan(step,init,(score_t[1:],alpha_t[1:]))
        ema_full=jnp.concatenate([init[None,...],ema_seq],0)
        ema = jnp.transpose(ema_full,(1,0,2))
        out = v*ema + residual
        out = nn.LayerNorm(epsilon=1e-5,dtype=self.dtype)(out)
        return SwiGLU(self.d_model,self.dtype)(out)

class Lo(nn.Module):
    d_model:int
    dtype:Any=DTYPE
    @nn.compact
    def __call__(self,x):
        h=nn.Dense(64,dtype=self.dtype)(x); h=nn.silu(h)
        h=nn.Dense(self.d_model,dtype=self.dtype)(h)
        return nn.LayerNorm(epsilon=1e-5,dtype=self.dtype)(h)+x

class Block(nn.Module):
    d_model:int
    dtype:Any=DTYPE
    @nn.compact
    def __call__(self,x):
        x=LoU(self.d_model,self.dtype)(x)
        x=Lo(self.d_model,self.dtype)(x)
        return x

class ReLM(nn.Module):
    vocab_size:int; max_seq_len:int; d_model:int; n_layers:int; dtype:Any=DTYPE
    def setup(self):
        self.token_embed = nn.Embed(self.vocab_size,self.d_model,dtype=self.dtype)
        self.pos_embed = nn.Embed(self.max_seq_len,self.d_model,dtype=self.dtype)
        self.blocks=[Block(self.d_model,self.dtype) for _ in range(self.n_layers)]
        self.ln_f=nn.LayerNorm(epsilon=1e-5,dtype=self.dtype)
    def __call__(self,x,deterministic=True):
        b,seq=x.shape
        pos=jnp.arange(seq)[None,:]
        x=self.token_embed(x)+self.pos_embed(pos)
        for blk in self.blocks: x=blk(x)
        x=self.ln_f(x)
        logits=jnp.einsum("bld,vd->blv",x,self.token_embed.embedding)
        return logits

# ------------------
# Loss & metrics
# ------------------
def smoothed_ce(logits,targets,pad_id,eps=0.1):
    vocab=logits.shape[-1]
    logits=logits.reshape(-1,vocab)
    targets=targets.reshape(-1)
    mask=(targets!=pad_id).astype(jnp.float32)
    one_hot=jax.nn.one_hot(targets,vocab)
    smooth=(1-eps)*one_hot+eps/vocab
    log_probs=jax.nn.log_softmax(logits)
    loss=-jnp.sum(smooth*log_probs,axis=-1)*mask
    return jnp.sum(loss)/(jnp.sum(mask)+1e-8)

def masked_ppl(logits,targets,pad_id,eps=0.1):
    vocab=logits.shape[-1]
    logits=logits.reshape(-1,vocab)
    targets=targets.reshape(-1)
    mask=(targets!=pad_id).astype(jnp.float32)
    one_hot=jax.nn.one_hot(targets,vocab)
    smooth=(1-eps)*one_hot+eps/vocab
    loss=-jnp.sum(smooth*jax.nn.log_softmax(logits),axis=-1)*mask
    return jnp.exp(jnp.sum(loss)/(jnp.sum(mask)+1e-8))

# ------------------
# Train state
# ------------------
class TrainState(train_state.TrainState): pass
def create_train_state(rng,model,lr):
    params=model.init(rng,jnp.zeros((1,SEQ_LEN),dtype=jnp.int32))["params"]
    tx=optax.chain(optax.clip_by_global_norm(1.0),optax.adamw(lr,b1=0.9,b2=0.95,eps=1e-8))
    return TrainState.create(apply_fn=model.apply,params=params,tx=tx)

# ------------------
# pmap step
# ------------------
@partial(jax.pmap, axis_name="batch")
def train_step(state,bx,by,rngs):
    def loss_fn(params):
        logits=state.apply_fn({"params":params},bx,deterministic=False)
        return smoothed_ce(logits,by,pad_id),logits
    (loss,logits),grads=jax.value_and_grad(loss_fn,has_aux=True)(state.params)
    grads=jax.lax.pmean(grads,"batch")
    state=state.apply_gradients(grads=grads)
    metrics={"loss":loss,"ppl":masked_ppl(logits,by,pad_id)}
    metrics=jax.lax.pmean(metrics,"batch")
    return state,metrics

# ------------------
# Top-p sampling (JAX-native)
# ------------------
def top_p_sample(rng, logits, p=0.9, temperature=1.0):
    probs=jax.nn.softmax(logits/temperature)
    sorted_probs,sorted_idx=jax.lax.top_k(probs,logits.shape[-1])
    cum_probs=jnp.cumsum(sorted_probs)
    mask=cum_probs<=p
    top_probs=jnp.where(mask,sorted_probs,0.0)
    top_probs=top_probs/jnp.sum(top_probs)
    return int(sorted_idx[jax.random.categorical(rng,jnp.log(top_probs))])

def generate_text(state,prompt,max_gen=256,p=0.9,temperature=0.8,min_len=20):
    params=jax.tree_map(lambda x: np.array(x[0]),state.params)
    tokens=sp.encode("<start> "+prompt,out_type=int)
    generated=tokens.copy()
    rng=random.PRNGKey(SEED)
    for step in range(max_gen):
        cur=generated[-SEQ_LEN:]
        if len(cur)<SEQ_LEN: cur=cur+[pad_id]*(SEQ_LEN-len(cur))
        x=jnp.array([cur],dtype=jnp.int32)
        logits=model.apply({"params":params},x,deterministic=True)[0,len(generated)-1]
        logits=logits.at[end_id].add(-5.0).at[pad_id].add(-10.0)
        next_id=top_p_sample(rng,logits,p,temperature)
        generated.append(next_id)
        if next_id==end_id and len(generated)>=min_len: break
    return sp.decode(generated)

# ------------------
# Training
# ------------------
rng=random.PRNGKey(SEED)
rng,init_rng=random.split(rng)
model=ReLM(vocab_size=vocab_size,max_seq_len=SEQ_LEN,d_model=512,n_layers=9,dtype=DTYPE)
state=create_train_state(init_rng,model,LEARNING_RATE)
state=jax.device_put_replicated(state,jax.local_devices())

global_step=0
for epoch in range(EPOCHS):
    print(f"Epoch {epoch+1}/{EPOCHS}")
    np_rng=np.random.default_rng(SEED+epoch)
    batch_iter=create_batch_iter(inputs,targets,GLOBAL_BATCH,np_rng)
    pbar=tqdm.tqdm(batch_iter,total=max(1,inputs.shape[0]//GLOBAL_BATCH))
    for bx,by in pbar:
        bx_sh,by_sh=shard(bx),shard(by)
        state,metrics=train_step(state,bx_sh,by_sh,jax.random.split(rng,NUM_DEVICES))
        m=jax.tree_util.tree_map(lambda x:x[0],metrics)
        pbar.set_postfix(loss=float(m["loss"]),ppl=float(m["ppl"]))
        global_step+=1

# ------------------
# Save
# ------------------
save_dir="./checkpoints"
os.makedirs(save_dir,exist_ok=True)
checkpoints.save_checkpoint(save_dir,jax.tree_map(lambda x:np.array(x),state),step=global_step,keep=3)
print("Saved checkpoint to",save_dir)

# ------------------
# Generate
# ------------------
print("\n\n===== 생성 결과 =====")
print(generate_text(state,"지난 2년 동안 출연연이 국가가 필요한 연구를",p=0.9))