[GPTJ] add gptj

[gongel]

PR types

New features

PR changes

Models

Description

• Add new model GPTJ
• Use example

import paddle
from paddlenlp.transformers import GPTJForCausalLM, GPTJTokenizer
tokenizer = GPTJTokenizer.from_pretrained('EleutherAI/gpt-j-6B')
model = GPTJForCausalLM.from_pretrained('EleutherAI/gpt-j-6B')
inputs = tokenizer("Welcome to use PaddlePaddle and PaddleNLP!", return_token_type_ids=False)
inputs = {k:paddle.to_tensor([v]) for (k, v) in inputs.items()}
outputs = model.generate(**inputs)

[gongel]

Mv to #3017