| """V4.3 random-initialized LM/chat pretraining with the expanded web pool.""" |
| import copy |
| import hashlib |
| import json |
| import math |
| from pathlib import Path |
| import random |
| import signal |
| import time |
| import torch |
|
|
| from vimeml.training.data import SentenceWindowDataset,file_sha,write_json |
| from vimeml.training.data_mixture import mixture_dataset |
| from vimeml.training.model_v4 import TinyGPTV4,GPTV4Config |
| from vimeml.training.train import (optimizer_for,learning_rate,atomic_checkpoint,rng_state, |
| restore_rng,resolve_precision,amp_context) |
| from vimeml.posttraining.streams import CommittedStream,loader_for,microbatches |
| from vimeml.posttraining.train import validate |
| from vimeml.posttraining.data import TOKENIZER_SHA |
|
|
| ROOT=Path(__file__).resolve().parents[3] |
| STAGE='v4.3' |
| TASK_CONTRACT={ |
| 'objective':'single_task_lm_token_normalized', |
| 'tasks':['old_web_lm','expansion_web_lm','chat_lm'], |
| 'normalization':'total supervised tokens per update', |
| 'lm':'ordinary_unmarked_LM_all_valid_targets', |
| 'conversion':'none; V4.1 conversion pool removed', |
| 'ime_validation':'none_in_training; deferred post-training over saved epoch checkpoints', |
| 'context_length':128,'tokenizer_sha256':TOKENIZER_SHA, |
| 'chat_fraction':0.05,'expansion':'nine additional FineWeb2-Edu shards, cross-pool deduplicated', |
| } |
|
|
|
|
| def read(path): |
| return json.loads(Path(path).read_text('utf-8')) |
|
|
|
|
| def chat_store_of(request): |
| for bank in request['joined_stores']: |
| if bank['token_dir'].rstrip('/').endswith('corpus-v41-chat-8k'): |
| return bank |
| raise ValueError('V4.3 mixture must contain the frozen chat bank') |
|
|
|
|
| def expansion_store_of(request): |
| for bank in request['joined_stores']: |
| if 'corpus-v43-exp8k' in bank['token_dir']: |
| return bank |
| raise ValueError('V4.3 mixture must contain the expansion bank') |
|
|
|
|
| def build_plan(config,root=ROOT,verify_files=True): |
| root=Path(root) |
| if config.get('stage')!=STAGE or config.get('architecture')!='tiny_gpt_v4' or config.get('initialization')!={'mode':'random'}: |
| raise ValueError('V4.3 requires explicit random initialization; no source checkpoint') |
| GPTV4Config(**config['model']) |
| s=dict(config['training']) |
| for key in ('lm_batch','lm_microbatch','epochs','num_workers','cpu_threads','log_every', |
| 'eval_every','checkpoint_every','validation_batch','bucket_multiplier','warmup_steps'): |
| if type(s[key]) is not int or s[key]<1: |
| raise ValueError(f'Invalid training integer: {key}') |
| if type(s.get('smoke_updates')) is not int or s['smoke_updates']<0: |
| raise ValueError('Invalid smoke update budget') |
| if type(s['seed']) is not int or not 0<=s['seed']<2**63: |
| raise ValueError('Invalid random seed') |
| for key in ('learning_rate','min_learning_rate','beta1','beta2','weight_decay','grad_clip'): |
| if not math.isfinite(s[key]) or s[key]<=0: |
| raise ValueError(f'Invalid training scalar: {key}') |
| compiled=config['runtime']['compile_backbone'] |
| if (s['device']=='cuda' and s['precision']=='bf16' and compiled): |
| pass |
| elif (s['device']=='cpu' and s['precision']=='fp32' and not compiled and s['smoke_updates']>0): |
| pass |
| else: |
| raise ValueError('V4.3 formal training is CUDA/BF16/compiled; only smoke runs are CPU/FP32') |
| if (not 0<s['min_learning_rate']<=s['learning_rate'] or s['beta1']>=1 or s['beta2']>=1 |
| or not 0<=s['prefix_crop_probability']<1 or s['lm_microbatch']>s['lm_batch']): |
| raise ValueError('V4.3 optimizer/microbatch contract mismatch') |
| mix_dir=root/config['data_mixture']['directory'] |
| mix=read(mix_dir/'manifest.json') |
| request=mix['request'] |
| if (mix['status']!='complete' or len(mix['epochs'])!=request['epochs'] |
| or request['seed']!=s['seed'] or request['crop_probability']!=s['prefix_crop_probability'] |
| or request['crop_minimum']!=8 or request['chat_fraction']!=.05 |
| or not 1<=s['epochs']<=request['epochs']): |
| raise ValueError('Frozen V4.3 mixture differs from training configuration') |
| if file_sha(mix_dir/'manifest.json')!=config['dataset_sha256']: |
| raise ValueError('V4.3 dataset manifest changed') |
| required={} |
| signatures={'dataset':config['dataset_sha256']} |
| for bank in request['joined_stores']: |
| folder,index=root/bank['token_dir'],root/bank['index_dir'] |
| manifest=read(folder/'manifest.json') |
| if file_sha(folder/'manifest.json')!=bank['token_manifest_sha256'] or file_sha(index/'manifest.json')!=bank['window_manifest_sha256']: |
| raise ValueError('Changed LM/expansion/chat bank manifest') |
| if manifest['tokenizer_model_sha256']!=TOKENIZER_SHA or manifest['vocab_size']!=8192: |
| raise ValueError('LM/expansion/chat vocabulary mismatch') |
| windows=read(index/'manifest.json') |
| for split in ('train','validation'): |
| for suffix in ('tokens.bin','offsets.bin','sources.bin'): |
| required[folder/f'{split}.{suffix}']=manifest['output_sha256'][f'{split}.{suffix}'] |
| required[index/f'{split}.windows.npz']=windows['splits'][split]['index_sha256'] |
| required[folder/'manifest.json']=bank['token_manifest_sha256'] |
| required[index/'manifest.json']=bank['window_manifest_sha256'] |
| primary=request['joined_stores'][0] |
| if config['token_dir']!=primary['token_dir'] or config['index_dir']!=primary['index_dir']: |
| raise ValueError('Primary model tokenizer/LM bank mismatch') |
| signatures.update(tokens=primary['token_manifest_sha256'],windows=primary['window_manifest_sha256']) |
| expansion=expansion_store_of(request) |
| signatures['expansion_tokens']=expansion['token_manifest_sha256'] |
| for bank in request['joined_stores'][:-1]: |
| required[root/bank['keep']]=bank['keep_sha256'] |
| for record in mix['epochs'][:s['epochs']]: |
| required[mix_dir/record['file']]=record['sha256'] |
| required[mix_dir/'manifest.json']=config['dataset_sha256'] |
| required[mix_dir/'request.json']=file_sha(mix_dir/'request.json') |
| tokenizer=root/config['tokenizer_dir']/'tokenizer.model' |
| if file_sha(tokenizer)!=TOKENIZER_SHA: |
| raise ValueError('Tokenizer changed') |
| required[tokenizer]=TOKENIZER_SHA |
| code={p.relative_to(root).as_posix():file_sha(p) for p in sorted((root/'src/vimeml').rglob('*.py'))} |
| code['scripts/training/train_v43.py']=file_sha(root/'scripts/training/train_v43.py') |
| signatures['code']=hashlib.sha256(json.dumps(code,sort_keys=True).encode()).hexdigest() |
| if verify_files: |
| for path,digest in required.items(): |
| if file_sha(path)!=digest: |
| raise ValueError('Changed training dependency: '+str(path)) |
| s['plan_epochs']=request['epochs'] |
| s['updates_per_epoch']=[math.ceil(r['windows']/s['lm_batch']) for r in mix['epochs'][:s['epochs']]] |
| s['windows_per_epoch']=[r['windows'] for r in mix['epochs'][:s['epochs']]] |
| s['max_steps']=sum(s['updates_per_epoch']) |
| return {'stage':STAGE,'parameters':15_070_848,'settings':s,'signatures':signatures,'code_sha256':code, |
| 'required_files':{p.relative_to(root).as_posix():h for p,h in required.items()}, |
| 'request':request,'task_contract':TASK_CONTRACT} |
|
|
|
|
| def initial_state(): |
| return {'epoch':0,'epoch_batch':0,'step':0,'lm_cursor':{'epoch':0,'batch':0,'offset':0}, |
| 'epoch_results':[],'best_lm':None,'training_seconds':0., |
| 'totals':{'lm':{k:0 for k in ('examples','input_tokens','supervised_tokens','padded_positions')}}} |
|
|
|
|
| def consumed_examples(state,plan): |
| s=plan['settings'] |
| e,b=state['epoch'],state['epoch_batch'] |
| updates=s['updates_per_epoch'] |
| total=sum(s['windows_per_epoch'][:e]) |
| if e<len(updates) and b: |
| total+=s['windows_per_epoch'][e] if b==updates[e] else b*s['lm_batch'] |
| return total |
|
|
|
|
| def validate_state(state,plan): |
| e,b=state['epoch'],state['epoch_batch'] |
| updates=plan['settings']['updates_per_epoch'] |
| if not 0<=e<=len(updates) or b<0 or (e==len(updates) and b) or (e<len(updates) and b>updates[e]): |
| raise ValueError('Invalid committed LM epoch cursor') |
| if state['step']!=sum(updates[:e])+b: |
| raise ValueError('Step does not match committed epoch updates') |
| if state['totals']['lm']['examples']!=consumed_examples(state,plan): |
| raise ValueError('LM exposure does not match committed updates') |
| if state['lm_cursor']!={'epoch':e,'batch':b,'offset':0}: |
| raise ValueError('LM stream cursor mismatch') |
| epochs=[r['epoch'] for r in state['epoch_results']] |
| allowed=list(range(1,e+1)) |
| if e<len(updates) and b==updates[e] and len(epochs)==e+1: |
| allowed.append(e+1) |
| if epochs!=allowed: |
| raise ValueError('Invalid completed/pending validation history') |
|
|
|
|
| def progress(state,plan,status='running',latest=None): |
| updates=plan['settings']['updates_per_epoch'] |
| e=state['epoch'] |
| fraction=state['epoch_batch']/updates[e] if e<len(updates) else 0 |
| return {'status':status,'step':state['step'],'max_steps':plan['settings']['max_steps'], |
| 'completed_lm_epochs':e+fraction,'lm_cursor':state['lm_cursor'], |
| 'totals':state['totals'],'training_seconds':state['training_seconds'],'latest_update':latest, |
| 'full_validation':state['epoch_results'][-1] if state['epoch_results'] else None, |
| 'best_lm_bpc':state['best_lm']} |
|
|
|
|
| def update_lm(model,optimizer,batches,s,device,precision): |
| denominator=sum(int((b['labels']!=-100).sum()) for b in batches) |
| if denominator<=0: |
| raise ValueError('The LM task needs supervised targets') |
| optimizer.zero_grad(set_to_none=True) |
| inputs=sum(int(b['lengths'].sum()) for b in batches) |
| examples=sum(len(b['lengths']) for b in batches) |
| positions=0 |
| pieces=[] |
| for batch in microbatches(batches,s['lm_microbatch']): |
| ids=batch['input_ids'].to(device,non_blocking=True) |
| labels=batch['labels'].to(device,non_blocking=True) |
| with amp_context(device,precision): |
| result=model(ids,labels) |
| loss=result['loss_sum']/denominator |
| pieces.append(result['loss_sum'].detach()) |
| loss.backward() |
| positions+=ids.numel() |
| value=float(torch.stack(pieces).sum()) |
| if not math.isfinite(value): |
| raise FloatingPointError('Non-finite LM training loss') |
| grad_norm=float(torch.nn.utils.clip_grad_norm_(model.parameters(),s['grad_clip'],error_if_nonfinite=True)) |
| optimizer.step() |
| return {'loss':value/denominator,'supervised_tokens':denominator,'input_tokens':inputs, |
| 'examples':examples,'padded_positions':positions,'grad_norm':grad_norm} |
|
|
|
|
| def checkpoint_payload(model,optimizer,state,config,plan,precision,initialization): |
| return {'format':'vimeml_tiny_gpt_v4','architecture':'tiny_gpt_v4','model':model.state_dict(), |
| 'model_config':model.configuration(),'optimizer':optimizer.state_dict(), |
| 'config':config,'signatures':plan['signatures'],'precision':precision, |
| 'step':state['step'],'epoch':state['epoch'],'training_state':copy.deepcopy(state), |
| 'tokenizer_identity':{'tokenizer_model_sha256':TOKENIZER_SHA,'vocab_size':8192, |
| 'special_ids':{'pad':0,'unk':1,'bos':2,'eos':3}}, |
| 'posttraining':{'stage':STAGE,'task_contract':TASK_CONTRACT}, |
| 'initialization':initialization,'rng':rng_state(), |
| 'scheduler':{'step':state['step'],'max_steps':plan['settings']['max_steps'], |
| 'warmup_steps':plan['settings']['warmup_steps'],'name':'cosine'}} |
|
|
|
|
| def restore_checkpoint(saved,model,optimizer,config,signatures,precision): |
| if (saved.get('format')!='vimeml_tiny_gpt_v4' or saved.get('architecture')!='tiny_gpt_v4' |
| or saved.get('model_config')!=GPTV4Config().__dict__ |
| or saved.get('posttraining',{}).get('stage')!=STAGE |
| or saved['posttraining'].get('task_contract')!=TASK_CONTRACT): |
| raise ValueError('Explicit compatible V4.3 checkpoint required') |
| expected={'tokenizer_model_sha256':TOKENIZER_SHA,'vocab_size':8192, |
| 'special_ids':{'pad':0,'unk':1,'bos':2,'eos':3}} |
| if saved.get('tokenizer_identity')!=expected: |
| raise ValueError('V4.3 checkpoint tokenizer identity mismatch') |
| if saved['config']!=config or saved['signatures']!=signatures or saved['precision']!=precision: |
| raise ValueError('V4.3 resume requires identical config, code, data and precision') |
| if saved['step']!=saved['training_state']['step'] or saved['epoch']!=saved['training_state']['epoch']: |
| raise ValueError('Checkpoint header and committed state disagree') |
| model.load_state_dict(saved['model'],strict=True) |
| optimizer.load_state_dict(saved['optimizer']) |
| return copy.deepcopy(saved['training_state']),saved['rng'],saved['initialization'] |
|
|
|
|
| def run(config,resume=False,root=ROOT): |
| from torch.utils.tensorboard import SummaryWriter |
| from vimeml.posttraining.infer import fp32_evaluation |
| root=Path(root) |
| output,log_dir=root/config['output_dir'],root/config['log_dir'] |
| if not resume and ((output.exists() and any(output.iterdir())) or (log_dir.exists() and any(log_dir.iterdir()))): |
| raise ValueError('Fresh V4.3 requires empty output and log directories') |
| print('Verifying frozen V4.3 union, tokenizer and per-epoch maps...',flush=True) |
| plan=build_plan(config,root,verify_files=True) |
| s=plan['settings'] |
| torch.set_num_threads(s['cpu_threads']) |
| random.seed(s['seed']) |
| torch.manual_seed(s['seed']) |
| device=torch.device(s['device']) |
| if device.type=='cuda' and not torch.cuda.is_available(): |
| raise ValueError('A GPU instance is required for formal V4.3 training') |
| precision=resolve_precision(device,s['precision']) |
| torch.set_float32_matmul_precision('high') |
| model=TinyGPTV4(GPTV4Config(**config['model'])).to(device) |
| optimizer=optimizer_for(model,s,device) |
| state=initial_state() |
| initialization={'mode':'random','seed':s['seed'],'source_checkpoint':None,'optimizer':'fresh_AdamW'} |
| restored=None |
| if resume: |
| saved=torch.load(output/'last.pt',map_location='cpu',weights_only=True) |
| state,restored,initialization=restore_checkpoint(saved,model,optimizer,config,plan['signatures'],precision) |
| validate_state(state,plan) |
| del saved |
| if state['epoch']==s['epochs']: |
| print('V4.3 is already complete',flush=True) |
| return progress(state,plan,'complete') |
| output.mkdir(parents=True,exist_ok=True) |
| write_json(output/'config.json',config) |
| write_json(output/'plan.json',plan) |
| if config['runtime']['compile_backbone']: |
| from vimeml.training.runtime_v2 import compile_backbone |
| compilation=compile_backbone(model) |
| else: |
| compilation=None |
| environment={'torch':str(torch.__version__),'cuda':torch.version.cuda,'device':str(device), |
| 'precision':precision,'parameters':model.parameter_count(), |
| 'initialization':initialization,'compilation':compilation,'validation_precision':'primitive_FP32', |
| 'smoke_updates':s['smoke_updates'],'epochs_used':s['epochs'],'plan_epochs':s['plan_epochs']} |
| if device.type=='cuda': |
| environment['gpu']=torch.cuda.get_device_name(device) |
| write_json(output/'environment.json',environment) |
| lm_train=mixture_dataset(config,root) |
| lm_val=SentenceWindowDataset(root/config['token_dir'],root/config['index_dir'],'validation') |
| chat_bank=chat_store_of(plan['request']) |
| chat_val=SentenceWindowDataset(root/chat_bank['token_dir'],root/chat_bank['index_dir'],'validation') |
| exp_bank=expansion_store_of(plan['request']) |
| exp_val=SentenceWindowDataset(root/exp_bank['token_dir'],root/exp_bank['index_dir'],'validation') |
| options={'workers':s['num_workers'],'multiplier':s['bucket_multiplier'],'pin_memory':device.type=='cuda'} |
| lm_loader=loader_for(lm_train,s['lm_batch'],seed=s['seed'],**options) |
| def val_loader(data): |
| return loader_for(data,s['validation_batch'],workers=0,seed=s['seed'],shuffle=False, |
| pin_memory=device.type=='cuda') |
| old_validation,chat_validation,exp_validation=val_loader(lm_val),val_loader(chat_val),val_loader(exp_val) |
| subset=sorted(random.Random(s['seed']+1000019).sample(range(len(lm_val)),min(4096,len(lm_val)))) |
| subset_loader=loader_for(lm_val,s['validation_batch'],workers=0,seed=s['seed'],indices=subset, |
| shuffle=False,pin_memory=device.type=='cuda') |
| writer=SummaryWriter(str(log_dir),purge_step=state['step']+1 if resume else None,flush_secs=5) |
| metrics=(output/'metrics.jsonl').open('a',encoding='utf-8',buffering=1) |
| requested=False |
| handlers={} |
| def request_stop(signum,frame): |
| nonlocal requested |
| if requested: |
| raise KeyboardInterrupt('Second interrupt; keep last committed checkpoint') |
| requested=True |
| print('Saving after current committed update/validation',flush=True) |
| for sig in (signal.SIGINT,signal.SIGTERM): |
| handlers[sig]=signal.getsignal(sig) |
| signal.signal(sig,request_stop) |
| def save(name='last'): |
| payload=checkpoint_payload(model,optimizer,state,config,plan,precision,initialization) |
| payload['training_regime']='random_initialized_lm_expansion_chat_pretraining' |
| atomic_checkpoint(output/f'{name}.pt',payload) |
| if restored is not None: |
| restore_rng(restored) |
| write_json(output/'progress.json',progress(state,plan,'running' if resume else 'initializing')) |
| try: |
| if not resume: |
| save() |
| while state['epoch']<s['epochs'] and not requested: |
| e=state['epoch'] |
| lm_stream=CommittedStream(lm_loader,state['lm_cursor']) |
| updates=s['updates_per_epoch'][e] |
| model.train() |
| while state['epoch_batch']<updates and not requested: |
| began=time.perf_counter() |
| lm_batch=lm_stream.next_batch() |
| rate=learning_rate(state['step']+1,s) |
| for group in optimizer.param_groups: |
| group['lr']=rate |
| result=update_lm(model,optimizer,[lm_batch],s,device,precision) |
| if device.type=='cuda': |
| torch.cuda.synchronize(device) |
| state['step']+=1 |
| state['epoch_batch']+=1 |
| state['lm_cursor']=lm_stream.state_dict() |
| seconds=time.perf_counter()-began |
| state['training_seconds']+=seconds |
| for field in state['totals']['lm']: |
| state['totals']['lm'][field]+=result[field] |
| if state['step']%s['log_every']==0: |
| latest={'step':state['step'],'learning_rate':rate,'seconds':seconds,**result} |
| metrics.write(json.dumps(latest)+'\n') |
| writer.add_scalar('lm/train_loss',result['loss'],state['step']) |
| writer.add_scalar('lm/supervised_tokens',state['totals']['lm']['supervised_tokens'],state['step']) |
| writer.add_scalar('lm/input_tokens',state['totals']['lm']['input_tokens'],state['step']) |
| writer.add_scalar('optimizer/learning_rate',rate,state['step']) |
| writer.add_scalar('optimizer/grad_norm',result['grad_norm'],state['step']) |
| write_json(output/'progress.json',progress(state,plan,latest=latest)) |
| print(f"step={state['step']}/{s['max_steps']} epoch={e+1} lm={result['loss']:.4f} seconds={seconds:.3f}",flush=True) |
| if state['step']%s['checkpoint_every']==0: |
| save() |
| if state['step']%s['eval_every']==0 and state['epoch_batch']<updates: |
| with fp32_evaluation(model): |
| subset_result=validate(model,subset_loader,device) |
| writer.add_scalar('lm/fixed_subset_loss',subset_result['loss'],state['step']) |
| write_json(output/'subset-validation.json',{'step':state['step'],**subset_result}) |
| if s['smoke_updates'] and state['step']>=s['smoke_updates']: |
| break |
| if s['smoke_updates'] and state['step']>=s['smoke_updates']: |
| break |
| if requested: |
| break |
| if not any(r['epoch']==e+1 for r in state['epoch_results']): |
| save() |
| write_json(output/'progress.json',progress(state,plan,'validating')) |
| print(f'[epoch {e+1}] full old LM, expansion and chat validation',flush=True) |
| before=rng_state() |
| with fp32_evaluation(model): |
| old_stats=read(root/config['token_dir']/'manifest.json')['splits']['validation'] |
| chat_stats=read(root/chat_bank['token_dir']/'manifest.json')['splits']['validation'] |
| exp_stats=read(root/exp_bank['token_dir']/'manifest.json')['splits']['validation'] |
| lv=validate(model,old_validation,device,old_stats['prediction_pairs'],old_stats['characters']) |
| chat=validate(model,chat_validation,device,chat_stats['prediction_pairs'],chat_stats['characters']) |
| ev=validate(model,exp_validation,device,exp_stats['prediction_pairs'],exp_stats['characters']) |
| restore_rng(before) |
| report={'epoch':e+1,'step':state['step'],'lm':lv,'chat':chat,'expansion':ev} |
| roles=[] |
| if state['best_lm'] is None or lv['bpc']<state['best_lm']: |
| state['best_lm']=lv['bpc'];roles.append('best-lm') |
| state['epoch_results'].append(report) |
| write_json(output/'full-validation.json',report) |
| for tag,value in (('lm/full_validation_bpc',lv['bpc']),('chat/full_validation_bpc',chat['bpc']), |
| ('expansion/full_validation_bpc',ev['bpc'])): |
| writer.add_scalar(tag,value,state['step']) |
| for role in roles: |
| save(role) |
| save(f'epoch-{e+1}') |
| print(f"[epoch {e+1}] LM BPC={lv['bpc']:.6f} chat BPC={chat['bpc']:.6f} expansion BPC={ev['bpc']:.6f}",flush=True) |
| state['epoch']+=1 |
| state['epoch_batch']=0 |
| state['lm_cursor']={'epoch':state['epoch'],'batch':0,'offset':0} |
| validate_state(state,plan) |
| save() |
| if s['smoke_updates'] and state['step']>=s['smoke_updates']: |
| save() |
| terminal='smoke_complete' |
| else: |
| terminal='complete' if state['epoch']==s['epochs'] else 'interrupted' |
| save() |
| result=progress(state,plan,terminal) |
| result['checkpoints']={n:str(output/f'{n}.pt') for n in ('best-lm','last') if (output/f'{n}.pt').exists()} |
| result['epoch_checkpoints']=sorted(p.name for p in output.glob('epoch-*.pt')) |
| if device.type=='cuda': |
| result['peak_allocated_MiB']=torch.cuda.max_memory_allocated(device)/2**20 |
| result['peak_reserved_MiB']=torch.cuda.max_memory_reserved(device)/2**20 |
| write_json(output/'summary.json',result) |
| write_json(output/'progress.json',result) |
| return result |
| except BaseException as error: |
| write_json(output/'failure.json',{'status':'failed','active':True,'error_type':type(error).__name__, |
| 'error':str(error),'last_committed_in_memory_step':state['step'],'safe_resume_checkpoint':str(output/'last.pt')}) |
| raise |
| finally: |
| writer.close();metrics.close() |
| for sig,handler in handlers.items(): |
| signal.signal(sig,handler) |
| lm_train.close() |
| for data in (lm_val,chat_val,exp_val): |
| data.close() |
|
|
