# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
#     http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import os
import sys

from paddle.distributed import fleet
import paddle.distributed as dist

__dir__ = os.path.dirname(os.path.abspath(__file__))
sys.path.append(os.path.abspath(os.path.join(__dir__, '../../')))

from ppfleetx.utils import config
from ppfleetx.utils.log import logger
from ppfleetx.data import build_dataloader, tokenizers
from ppfleetx.models import build_module
from ppfleetx.core import EagerEngine
from ppfleetx.distributed.apis import env

if __name__ == "__main__":
    args = config.parse_args()
    cfg = config.get_config(args.config, overrides=args.override, show=False)

    if dist.get_world_size() > 1:
        env.init_dist_env(cfg)

    env.set_seed(cfg.Global.seed)

    module = build_module(cfg)
    config.print_config(cfg)

    tokenizer = tokenizers.GPTTokenizer.from_pretrained("gpt2")
    engine = EagerEngine(configs=cfg, module=module, mode='inference')

    input_text = 'Hi, GPT2. Tell me who Jack Ma is.'
    input_ids = [tokenizer.encode(input_text)]

    outs = engine.inference([input_ids])

    ids = list(outs.values())[0]
    out_ids = [int(x) for x in ids[0]]
    result = tokenizer.decode(out_ids)
    result = input_text + result

    print('Prompt:', input_text)
    print('Generation:', result)
