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import torch
import torch.nn.functional as F
from fengshen.models.transfo_xl_paraphrase import TransfoXLModel
from fengshen.utils import top_k_logits, get_masks_and_position_ids
from transformers import T5Tokenizer
def get_batch(context_tokens, mem_length, batch_size=1):
tokens = context_tokens
tokens = tokens.view(batch_size, -1).contiguous()
# Get the masks and postition ids.
attention_mask, position_ids = get_masks_and_position_ids(tokens, mem_length=mem_length)
return tokens, attention_mask, position_ids
def paraphrase_generate(model,
tokenizer,
input_text,
device=0,
mem_length=512,
temperature=1.,
top_p=0.9,
eod_token=50000):
''' Generate with fixed prompt pretrained '''
prompt = f"“{input_text}”的相似句是“"
counter = 0
prompt_tokens = tokenizer.encode(prompt)[:-1]
tokens, attention_mask, position_ids = get_batch(
torch.LongTensor(prompt_tokens), mem_length, batch_size=1)
tokens, attention_mask, position_ids = tokens.cuda(
device), attention_mask.cuda(device), position_ids.cuda(device)
org_context_length = tokens.shape[-1]
model = model.cuda(device)
while counter < 100:
if counter == 0:
mems = [] # empty at the begining
output = model(input_ids=tokens, attention_mask=attention_mask,
position_ids=position_ids, hidden_states=mems)
logits, mems = output.logits, output.hidden_states
else:
index = org_context_length + counter
output = model(input_ids=tokens[:, index - 1: index], position_ids=tokens.new_ones((1, 1)) * (index - 1),
attention_mask=tokens.new_ones(1, 1, 1, mem_length + 1, device=device,
dtype=torch.float), hidden_states=mems)
logits, mems = output.logits, output.hidden_states
logits = logits[:, -1]
logits /= temperature
logits = top_k_logits(logits, top_k=0, top_p=top_p)
log_probs = F.softmax(logits, dim=-1)
prev = torch.multinomial(log_probs, num_samples=1)[0]
is_end = prev == eod_token
if is_end:
break
tokens = torch.cat((tokens, prev.view(1, 1)), dim=1)
counter += 1
out_tokens = tokens.view(-1).contiguous().tolist()[len(prompt_tokens):]
res = tokenizer.decode(out_tokens).split('”')[0]
return res
if __name__ == "__main__":
device = 0
tokenizer = T5Tokenizer.from_pretrained('IDEA-CCNL/Randeng-TransformerXL-1.1B-Paraphrasing-Chinese',
eos_token='<|endoftext|>',
extra_ids=0)
model = TransfoXLModel.from_pretrained('IDEA-CCNL/Randeng-TransformerXL-1.1B-Paraphrasing-Chinese')
input_text = "年轻教师选择农村学校，还是县城学校？"
res = paraphrase_generate(model, tokenizer, input_text, device=device)
print(res)
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