[BUG] got an unexpected keyword argument 'train_percent_check' when using trainer
🐛 Bug
train_percent_check option does not work:
Traceback (most recent call last):
  File "train_lightning.py", line 364, in <module>
    trainer = pl.Trainer(train_percent_check=0.1,gpus=2)
  File "/home/anaconda3/envs/nvidia-seg-pt15/lib/python3.6/site-packages/pytorch_lightning/trainer/connectors/env_vars_connector.py", line 42, in overwrite_by_env_vars
    return fn(self, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'train_percent_check'

Runs fine if I don't use the keyword.
Code:
if __name__ == '__main__':
    trainer_sys = TrainSystem()    
    trainer = pl.Trainer(train_percent_check=0.1,gpus=1)    
    trainer.fit(trainer_sys)

Environment
cudatoolkit               10.2.89              hfd86e86_1
python                    3.6.13               hdb3f193_0
pytorch                   1.5.1           py3.6_cuda10.2.89_cudnn7.6.5_0    pytorch
pytorch-lightning         1.2.3              pyhd8ed1ab_0    conda-forge
torchvision               0.6.1                py36_cu102    pytorch
GPU: 2080 Ti