def save_checkpoint(self, val_loss, model, model_dir):
'''Saves model when validation loss decrease.'''
if self.verbose:
self.logger.info(f'Validation loss decreased ({self.val_loss_min:.6f} --> {val_loss:.6f}). Saving model ...')
model.save_pretrained(model_dir)
TOKENIZER.save_pretrained(model_dir)
self.val_loss_min = val_loss
def test_one_to_many(task_load):
score_dicts = []
for ep in range(args.n_train_epochs[task_load]):
model_dir = get_model_dir([task_load])
model_path = os.path.join(model_dir, 'model-{}'.format(ep+1))
config_path = os.path.join(model_dir,CONFIG_NAME)
gen_token = get_gen_token(task_load)
TOKENIZER.add_tokens([gen_token])
SPECIAL_TOKENS[task_load] = gen_token
SPECIAL_TOKEN_IDS[task_load] = TOKENIZER.convert_tokens_to_ids(gen_token)
model_config = CONFIG_CLASS.from_json_file(config_path)
model = MODEL_CLASS(model_config).cuda().eval()
state_dict = torch.load(model_path, map_location='cuda:0')
model.load_state_dict(state_dict)
if not args.fp32:
model = FP16_Module(model)
model.ep = ep
model.model_dir = model_dir
logger.info("task: {}, epoch: {}".format(task_load, ep+1))
score_dict = {k:None for k in args.tasks}
with torch.no_grad():
for task_eval in args.tasks:
test_one_to_one(task_load, task_eval, model, score_dict)
logger.info("score: {}".format(score_dict))
score_dicts.append(score_dict)
with open(os.path.join(model_dir, "metrics.json"),"w") as f:
json.dump(score_dicts, f)
def read_extra_data(gen_path, train_extra_data):
with open(gen_path,"r") as lm_file:
reader = csv.reader(lm_file,delimiter=',')
next(reader)
for row in reader:
row = TOKENIZER.encode(row[0].strip())
train_extra_data.append(row)
def get_real_data(task, train_extra_data, accum=True, encode=True):
task_idx = args.tasks.index(task)
gen_size = DATA_ATTRS[task]["train"]["data_size"]
if accum:
prev_tasks = args.tasks[:task_idx]
gen_size = int(np.ceil(gen_size * args.gen_lm_sample_percentage))//len(prev_tasks)
else:
prev_tasks = [args.tasks[task_idx-1]]
gen_size = int(gen_size * args.gen_lm_sample_percentage)
datum = []
for prev_task in prev_tasks:
with open(TASK_DICT[prev_task]["train"],"r") as f:
data = data_expand(json.load(f)["data"])
indices = np.random.choice(range(len(data)), gen_size)
for i in indices:
d = parse_single_real_data(data[i],prev_task)
datum.append(d)
if encode:
train_extra_data.append(TOKENIZER.encode(d))
model_dir = get_model_dir([prev_task])
dump_path = os.path.join(model_dir,"real.csv")
write_extra_data(dump_path, datum)
return dump_path
def parallel_tokenization(self, d):
examples = []
context = TOKENIZER.encode(d["context"])
max_a_len = 0
for i3, qa in enumerate(d["qas"]):
question = TOKENIZER.encode(qa["question"])
raw_answers = qa["answers"]
if len(raw_answers) == 0:
assert qa["is_impossible"]
raw_answers.append({"text": ""})
answer = []
for i, raw_answer in enumerate(raw_answers):
answer.extend(TOKENIZER.encode(raw_answer["text"]))
if i != len(raw_answers) - 1:
answer.append(self.pad_token)
max_a_len = max(max_a_len, len(answer))
examples.append(self.parse_example(self.gen_token, context, question, answer, qa.get("id", 0 if not args.test_training_set else d["pid"]+"_%d"%i3)))
return examples, max_a_len
def create_extra_data(task, prev_task, model, train_extra_data):
if args.real_sample:
logger.info(f"using real data as extra data")
return get_real_data(task, train_extra_data)
task_cnt = args.tasks.index(task)
model_dir = get_model_dir([prev_task])
gen_path = os.path.join(model_dir, "lm.csv")
if os.path.exists(gen_path):
logger.info(f"extra data exists in {gen_path}, read it!")
return read_extra_data(gen_path, train_extra_data)
gen_size = DATA_ATTRS[task]["train"]["data_size"]
gen_size = int(np.ceil(gen_size * args.gen_lm_sample_percentage))
gen_size -= (gen_size % task_cnt)
if args.debug:
gen_size = task_cnt
model.eval()
need_process = OrderedDict()
qa_results = []
for task_name in args.tasks[:task_cnt]:
qa_results.extend([
torch.tensor([SPECIAL_TOKEN_IDS[task_name]])
for _ in range(gen_size // task_cnt)
])
all_pasts = [[
torch.empty(2,
MODEL_CONFIG.n_head,
0,
MODEL_CONFIG.n_embd // MODEL_CONFIG.n_head,
dtype=torch.float if args.fp32 else torch.half).cuda()
for _ in range(gen_size)
] for __ in range(MODEL_CONFIG.n_layer)]
max_tot_lens = [args.max_len for _ in range(gen_size)]
for i in range(gen_size):
need_process.update([[i, None]])
if len(need_process) > int(args.memory_sizes[0] * 0.12):
sample_sequence(model, need_process, qa_results, all_pasts,
max_tot_lens)
sample_sequence(model, need_process, qa_results, all_pasts, max_tot_lens)
model.train()
qa_results = [res.tolist() for res in qa_results]
train_extra_data.extend(qa_results)
qa_results = [TOKENIZER.decode(res) for res in qa_results]
write_extra_data(gen_path, qa_results)
def test_one_to_one(task_load, task_eval, model, score_dict):
logger.info("start to test { task: %s (load) %s (eval), seq train type: %s }" % (task_load, task_eval, args.seq_train_type))
test_qadata = QADataset(TASK_DICT[task_eval]["test"] , "test", SPECIAL_TOKEN_IDS[task_load]).sort()
max_a_len = test_qadata.max_a_len
test_dataloader = create_dataloader(test_qadata, "test")
n_examples = len(test_qadata)
logger.info("len of test dataset: {}".format(n_examples))
need_process = OrderedDict()
qa_results = [0 for _ in range(n_examples)]
all_pasts = [[0 for _ in range(n_examples)] for __ in range(MODEL_CONFIG.n_layer)]
max_tot_lens = [0 for _ in range(n_examples)]
cnt = 0
for n_steps, (cqs, len_cqs, _, _, _, _, _) in enumerate(test_dataloader):
# assume n_gpus == 1
cqs = cqs[0]
len_cqs = len_cqs[0]
n_inputs = cqs.shape[0]
all_outputs = model(input_ids=cqs.cuda())
outputs = all_outputs[0]
if args.model_name == "gpt2":
pasts = all_outputs[1]
next_logits = outputs[range(n_inputs), len_cqs-1, :] / args.temperature_qa
next_tokens = logits_to_tokens(next_logits).cpu()
for i in range(n_inputs):
max_tot_lens[cnt] = max_a_len + test_qadata[cnt][1]
qa_results[cnt] = cqs[i][:len_cqs[i]]
if next_tokens[i] != SPECIAL_TOKEN_IDS["eos_token"]:
qa_results[cnt] = torch.cat((cqs[i][:len_cqs[i]], next_tokens[i]))
if len(qa_results[cnt]) not in [max_tot_lens[cnt], args.max_len]:
need_process.update([[cnt, None]])
if args.model_name == "gpt2":
for layer_id in range(MODEL_CONFIG.n_layer):
all_pasts[layer_id][cnt] = pasts[layer_id][:, i, ..., :len_cqs[i], :].type(torch.float32 if args.fp32 else torch.half)
cnt += 1
if len(need_process) > int(12 * args.memory_sizes[0] / cqs.shape[1]): # dynamic threshold to avoid out of memory
sample_sequence(model, need_process, qa_results, all_pasts, max_tot_lens)
sample_sequence(model, need_process, qa_results, all_pasts, max_tot_lens)
if task_eval in ['wikisql','woz.en','multinli.in.out']:
ids = test_qadata.get_indices()
test_qadata.sort_by_index()
qa_results = [x[1] for x in sorted([(i, g) for i, g in zip(ids, qa_results)])]
for i in range(len(test_qadata)):
_, len_cq, _, _, Y, _, _, _ = test_qadata[i]
if task_eval in ['wikisql','woz.en']:
Y = test_qadata.answers[i]
else:
Y = list(filter(lambda x: x != -1, Y))[:-1] # remove eos
Y = ' '.join([str(y) for y in Y]).split(str(SPECIAL_TOKEN_IDS["pad_token"]))
Y = [TOKENIZER.decode(list(map(int, y.split()))) for y in Y]
qa_results[i] = [TOKENIZER.decode(qa_results[i].tolist()[len_cq:]), Y]
get_test_score(task_eval, qa_results, score_dict)
model_dir = model.model_dir
ep = model.ep
results_path = os.path.join(model_dir,"qa_{}_{}.csv".format(task_eval,ep+1))
if not args.debug:
with open(results_path, "w",encoding="utf-8") as f:
qa_writer = csv.writer(f,delimiter=',')
qa_writer.writerow(["y","pred"])
for pred, y in qa_results:
if task_eval == 'wikisql':
y = y["answer"]
elif task_eval == 'woz.en':
y = y[1]
qa_writer.writerow([y,pred])
return model, score_dict
def train(task_ids, model):
tasks = [args.tasks[task_id] for task_id in task_ids]
logger.info("start to train { task: %s, seq train type: %s }" %
(tasks, args.seq_train_type))
model_dir = get_model_dir(tasks)
make_dir(model_dir)
#train_dataset = [(TASK_DICT[t]["train"] if not args.seq_distil else TASK_DICT[t]["train"].replace("train", "distil")) for t in tasks]
train_dataset = [
swap_name(TASK_DICT[t]["train"], args.seq_distil, args.ref1)
for t in tasks
]
train_extra_data = []
if "lll" in args.seq_train_type and task_ids[0] > 0 and not args.skip_tasks:
prev_task = args.tasks[task_ids[0] - 1]
with torch.no_grad():
create_extra_data(tasks[0], prev_task, model, train_extra_data)
elif "gem" in args.seq_train_type and task_ids[0] > 0:
get_real_data(tasks[0], train_extra_data, accum=False, encode=True)
args.memory_data.append(train_extra_data)
train_extra_data = []
logger.info('extra training data size: {}'.format(len(train_extra_data)))
if not model:
# which_model_to_load = model_dir if os.path.isfile(os.path.join(model_dir, FINAL_SAVE_NAME)) else args.model_name
model = MODEL_CLASS.from_pretrained(args.model_name).cuda()
model.resize_token_embeddings(len(TOKENIZER))
if not args.fp32:
model = FP16_Module(model)
gen_token = get_gen_token(tasks[0])
TOKENIZER.add_tokens([gen_token])
TOKENIZER.save_pretrained(model_dir)
SPECIAL_TOKENS[tasks[0]] = gen_token
SPECIAL_TOKEN_IDS[tasks[0]] = TOKENIZER.convert_tokens_to_ids(gen_token)
logger.info('gen token = {} , gen token id = {}'.format(
gen_token, SPECIAL_TOKEN_IDS[tasks[0]]))
MODEL_CONFIG.vocab_size = len(TOKENIZER)
MODEL_CONFIG.to_json_file(os.path.join(model_dir, CONFIG_NAME))
global TOKENS_WEIGHT
if len(TOKENIZER) != TOKENS_WEIGHT.shape[0]:
TOKENS_WEIGHT = torch.cat((TOKENS_WEIGHT, torch.ones([1]).cuda()))
if args.skip_tasks and len(tasks) == 1:
logger.info("*********** skip task: {} ***********".format(tasks[0]))
if tasks[0] in args.skip_tasks:
if len(args.skip_tasks) == 1:
model_dir = get_model_dir(tasks)
model_path = os.path.join(model_dir, FINAL_SAVE_NAME)
config_path = os.path.join(model_dir, CONFIG_NAME)
model_config = CONFIG_CLASS.from_json_file(config_path)
model = MODEL_CLASS(model_config).cuda()
state_dict = torch.load(model_path)
model.load_state_dict(state_dict)
if not args.fp32:
model = FP16_Module(model)
if args.seq_train_type in REG_TYPE_KEYS:
logger.info("calulating reg_params ...")
train_qadata = QADataset(train_dataset, "train",
SPECIAL_TOKEN_IDS[tasks[0]],
train_extra_data)
max_train_batch_size = max(
len(train_qadata) // args.min_n_steps,
args.min_batch_size)
train_dataloader = create_dataloader(
train_qadata, "train", max_train_batch_size)
parallel_model = DataParallelModel(WrapModel(model),
args.device_ids)
regularizer = REG_TYPES[args.seq_train_type](
model, parallel_model, [train_dataloader], tasks[0])
regularizer.task_start_do()
regularizer.task_end_do()
torch.save(model.state_dict(),
os.path.join(model_dir, FINAL_SAVE_NAME))
logger.info("done reg_params!")
args.skip_tasks.remove(tasks[0])
return model
model.resize_token_embeddings(
len(TOKENIZER) if not args.multitask_specific else len(TOKENIZER) + 4)
if args.multitask_specific:
for i in range(4):
TOKENS_WEIGHT = torch.cat((TOKENS_WEIGHT, torch.ones([1]).cuda()))
if args.distil:
teacher_model = MODEL_CLASS.from_pretrained(args.model_name).cuda()
teacher_vocab_size = json.load(
open("models/gpt2/lll/{task}_0.2/{task}/config.json".format(
task=tasks[0])))['vocab_size']
teacher_model.resize_token_embeddings(teacher_vocab_size)
print("load teacher model from {}".format(
"models/gpt2/lll/{task}_0.2/{task}/model-finish".format(
task=tasks[0])))
teacher_model.load_state_dict(
torch.load("models/gpt2/lll/{task}_0.2/{task}/model-finish".format(
task=tasks[0])))
if not args.fp32:
teacher_model = FP16_Module(teacher_model)
teacher_model.eval()
teacher_model = DataParallelModel(WrapModel(teacher_model),
args.device_ids)
if not args.fp32: # again because resize_token_embeddings makes embedding layer fp32
model = FP16_Module(model)
parallel_model = DataParallelModel(WrapModel(model), args.device_ids)
train_qadata = QADataset(train_dataset, "train",
SPECIAL_TOKEN_IDS[tasks[0]], train_extra_data)
max_train_batch_size = max(
len(train_qadata) // args.min_n_steps, args.min_batch_size)
train_dataloader = create_dataloader(train_qadata, "train",
max_train_batch_size)
if not args.unbound and args.seq_train_type not in [
"multitask", "multilm"
]:
#n_train_epochs = TASK_DICT[tasks[0]]["n_train_epochs"]
n_train_epochs = args.n_train_epochs[tasks[0]]
else:
n_train_epochs = args.n_train_epochs['_'.join(tasks)]
n_train_optimization_steps = len(train_qadata) * n_train_epochs
logger.info(
'len of train dataset: {} , max train batch size {} , num of opt steps: {}'
.format(len(train_qadata), max_train_batch_size,
n_train_optimization_steps))
param_optimizer = list(model.named_parameters())
no_decay = ['bias', 'LayerNorm.bias', 'LayerNorm.weight']
optimizer_grouped_parameters = [{
'params':
[p for n, p in param_optimizer if not any(nd in n for nd in no_decay)],
'weight_decay':
args.weight_decay
}, {
'params':
[p for n, p in param_optimizer if any(nd in n for nd in no_decay)],
'weight_decay':
0.0
}]
if "gem" in args.seq_train_type:
model.task_id = task_ids[0]
if not hasattr(model, "grad_dims"):
model.grad_dims = []
for param in model.parameters():
model.grad_dims.append(param.data.numel())
if not hasattr(model, "grads"):
model.grads = torch.zeros(sum(model.grad_dims), len(args.tasks))
model.grads = model.grads.cuda()
if args.seq_train_type in REG_TYPE_KEYS:
optimizer = Weight_Regularized_AdamW(optimizer_grouped_parameters,
lr=args.learning_rate,
eps=args.adam_epsilon)
else:
optimizer = AdamW(optimizer_grouped_parameters,
lr=args.learning_rate,
eps=args.adam_epsilon)
if not args.fp32:
optimizer = FP16_Optimizer(optimizer,
static_loss_scale=None,
dynamic_loss_scale=True,
dynamic_loss_args={
'scale_window': 100,
'min_scale': 1,
'delayed_shift': 2
})
scheduler = AnnealingLR(optimizer,
start_lr=args.learning_rate,
warmup_iter=int(args.n_warmup_ratio *
len(train_qadata)),
num_iters=int(n_train_optimization_steps),
decay_style=args.decay_style)
train_loss_fct = DataParallelCriterion(
CrossEntropyLoss(ignore_index=FILL_VAL, weight=TOKENS_WEIGHT),
args.device_ids)
if args.distil:
kd_loss_fct = DataParallelCriterion(
nn.KLDivLoss(reduction="batchmean"), args.device_ids)
if args.seq_train_type in REG_TYPE_KEYS:
copy_train_dataloader = create_dataloader(train_qadata, "train",
max_train_batch_size)
prev_task = args.tasks[task_ids[0] - 1]
regularizer = REG_TYPES[args.seq_train_type](model, parallel_model,
[copy_train_dataloader],
tasks[0], prev_task)
regularizer.task_start_do()
tot_n_steps = 0
train_once = TrainStep(model, optimizer, scheduler)
if "gem" in args.seq_train_type and task_ids[0] != 0:
gem_step = GEMStep(model, parallel_model, train_loss_fct, optimizer)
model.train()
for ep in range(n_train_epochs):
cum_loss, cum_qa_loss, cum_lm_loss, cur_n_inputs = 0, 0, 0, 0
for n_steps, (_, _, cqa, _, Y, gen_X, gen_Y,
is_extra) in enumerate(train_dataloader):
n_inputs = sum(_cqa.shape[0] for _cqa in cqa)
if args.multitask_specific:
for i in range(len(is_extra)):
gen_X[i][:, 0] += is_extra[i]
is_extra[i] = is_extra[i] * 0
for i in range(len(cqa)):
cqa[i] = (cqa[i].to(args.device_ids[i]), )
Y[i] = Y[i].to(args.device_ids[i])
gen_X[i] = (gen_X[i].to(args.device_ids[i]), )
gen_Y[i] = gen_Y[i].to(args.device_ids[i])
is_extra[i] = is_extra[i].to(args.device_ids[i])
if args.distil:
losses = get_distil_losses(teacher_model,
parallel_model,
cqa,
Y,
gen_X,
gen_Y,
is_extra,
kd_loss_fct,
train_loss_fct,
args.temperature_kd,
pad_idx=FILL_VAL)
else:
losses = get_losses(parallel_model, cqa, Y, gen_X, gen_Y,
train_loss_fct)
loss = sum(losses)
if "gem" in args.seq_train_type and task_ids[0] != 0:
gem_step(task_ids[0])
train_once(loss, n_inputs)
qa_loss = losses[0].item() * n_inputs
lm_loss = losses[1].item() * n_inputs
cum_loss += (qa_loss + lm_loss)
cum_qa_loss += qa_loss
cum_lm_loss += lm_loss
cur_n_inputs += n_inputs
if (n_steps + 1) % args.logging_steps == 0:
logger.info(
'progress {:.3f} , lr {:.1E} , loss {:.3f} , qa loss {:.3f} , lm loss {:.3f} , avg batch size {:.1f}'
.format(ep + cur_n_inputs / len(train_qadata),
scheduler.get_lr(), cum_loss / cur_n_inputs,
cum_qa_loss / cur_n_inputs,
cum_lm_loss / cur_n_inputs,
cur_n_inputs / (n_steps + 1)))
torch.save(model.state_dict(),
os.path.join(model_dir, SAVE_NAME + str(ep + 1)))
tot_n_steps += (n_steps + 1)
logger.info(
'epoch {}/{} done , tot steps {} , lr {:.1E} , loss {:.2f} , qa loss {:.2f} , lm loss {:.2f} , avg batch size {:.1f}'
.format(ep + 1, n_train_epochs, tot_n_steps, scheduler.get_lr(),
cum_loss / cur_n_inputs, cum_qa_loss / cur_n_inputs,
cum_lm_loss / cur_n_inputs, cur_n_inputs / (n_steps + 1)))
# task end do for reg
if args.seq_train_type in REG_TYPE_KEYS:
regularizer.task_end_do()
torch.save(model.state_dict(), os.path.join(model_dir, FINAL_SAVE_NAME))
return model
