Lucas Bezerra

When executing `Burger 2D.ipynb` I get the following error: ``` model.train() --------------------------------------------------------------------------- IndexError Traceback (most recent call last) Input In [5], in () ----> 1 model.train() File ~/code/pinn-pytorch/grad/pytorchPDE.py:111, in PytorchPDE.train(self,...

Minor fixes that ensure the package works with newer versions of Numpy. Also sets `Pyglet

I noticed the package is not compatible with recent NumPy and Gym versions, so I set them to `numpy==1.26.1` and `gym==0.23.1` in `setup.py`. This seemed to fix the compatibility issues....