torch2Paddle源码拼写出错

[seancoding1]

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torch2Paddle源码拼写出错
位置在：x2paddle/project_convertor/pytorch/torch2paddle/io.py, line 172,
seld.batch_sampler.sampler = sample r改成 self.batch_sampler.sampler = sampler

下面的文字请保留在PR说明的最后面，并在提完PR后，根据实际情况勾选确认以下情况

Please check the follow step before merging this pull request

• Python code style verification
• Review all the code diff by yourself
• All models(TensorFLow/Caffe/ONNX/PyTorch) testing passed
• Details about your pull request, releated issues

If this PR add new model support, please update model_zoo.md and add model to out test model zoos(@wjj19950828)

• New Model Supported
• No New Model Supported

[wjj19950828]

@seancoding1 提PR流程如下：
1、fork X2Paddle分支，并git clone 你的repo
2、输入下列命令

git remote add upstream https://github.com/PaddlePaddle/X2Paddle.git
git fetch upstream
git remote -v #查看
git checkout -b 分支名
git merge upstream/develop

3、在你的分支上修改后，提PR到对应分支名