XGLM-4.5B 是一个多语言自回归语言模型（拥有 45 亿参数），其训练数据来源于包含 134 种不同语言的平衡语料库。该模型在论文《Few-shot Learning with Multilingual Language Models》（https://arxiv.org/abs/2112.10668）中首次提出，作者为 Xi Victoria Lin*、Todor Mihaylov、Mikel Artetxe、Tianlu Wang、Shuohui Chen、Daniel Simig、Myle Ott、Naman Goyal、Shruti Bhosale、Jingfei Du、Ramakanth Pasunuru、Sam Shleifer、Punit Singh Koura、Vishrav Chaudhary、Brian O'Horo、Jeff Wang、Luke Zettlemoyer、Zornitsa Kozareva、Mona Diab、Veselin Stoyanov、Xian Li*（*同等贡献）。原始实现已在 此仓库 中发布。
关于模型的预期用途，请参考 XGLM-4.5B 开发团队发布的 模型卡片。
以下代码片段展示了如何使用英语、中文和印地语的示例，以 GPT-3 风格的零样本方式在合理替代选择（COPA）任务上评估我们的模型。
import torch
import torch.nn.functional as F
from transformers import XGLMTokenizer, XGLMForCausalLM
tokenizer = XGLMTokenizer.from_pretrained("facebook/xglm-4.5B")
model = XGLMForCausalLM.from_pretrained("facebook/xglm-4.5B")
data_samples = {
'en': [
{
"premise": "I wanted to conserve energy.",
"choice1": "I swept the floor in the unoccupied room.",
"choice2": "I shut off the light in the unoccupied room.",
"question": "effect",
"label": "1"
},
{
"premise": "The flame on the candle went out.",
"choice1": "I blew on the wick.",
"choice2": "I put a match to the wick.",
"question": "cause",
"label": "0"
}
],
'zh': [
{
"premise": "我想节约能源。",
"choice1": "我在空着的房间里扫了地板。",
"choice2": "我把空房间里的灯关了。",
"question": "effect",
"label": "1"
},
{
"premise": "蜡烛上的火焰熄灭了。",
"choice1": "我吹灭了灯芯。",
"choice2": "我把一根火柴放在灯芯上。",
"question": "cause",
"label": "0"
}
],
'hi': [
{
"premise": "M te vle konsève enèji.",
"choice1": "Mwen te fin baleye chanm lib la.",
"choice2": "Mwen te femen limyè nan chanm lib la.",
"question": "effect",
"label": "1"
},
{
"premise": "Flam bouji a te etenn.",
"choice1": "Mwen te soufle bouji a.",
"choice2": "Mwen te limen mèch bouji a.",
"question": "cause",
"label": "0"
}
]
}
def get_logprobs(prompt):
inputs = tokenizer(prompt, return_tensors="pt")
input_ids, output_ids = inputs["input_ids"], inputs["input_ids"][:, 1:]
outputs = model(**inputs, labels=input_ids)
logits = outputs.logits
logprobs = torch.gather(F.log_softmax(logits, dim=2), 2, output_ids.unsqueeze(2))
return logprobs
# Zero-shot evaluation for the Choice of Plausible Alternatives (COPA) task.
# A return value of 0 indicates that the first alternative is more plausible,
# while 1 indicates that the second alternative is more plausible.
def COPA_eval(prompt, alternative1, alternative2):
lprob1 = get_logprobs(prompt + "\n" + alternative1).sum()
lprob2 = get_logprobs(prompt + "\n" + alternative2).sum()
return 0 if lprob1 > lprob2 else 1
for lang in data_samples_long:
for idx, example in enumerate(data_samples_long[lang]):
predict = COPA_eval(example["premise"], example["choice1"], example["choice2"])
print(f'{lang}-{idx}', predict, example['label'])
# en-0 1 1
# en-1 0 0
# zh-0 1 1
# zh-1 0 0
# hi-0 1 1
# hi-1 0 0