Minor enhancement for tensorrt op converter of fluid inference. (#12269) · Issue · PaddlePaddle / Paddle

Minor enhancement for tensorrt op converter of fluid inference.

Created by: NHZlX

argument not be inited.
- https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/fluid/inference/tensorrt/convert/ut_helper.h#71
The value of random initialization is too large, which can cause test failure.
- https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/fluid/inference/tensorrt/convert/ut_helper.h#L42
We should not set the batch size in ITensor.
Refine the action, fc op and the uttest.
Refine the tensorrt engine op.