TypeError: Unknown parameter type: <class 'theano.tensor.var.TensorVariable'> in the CartPole example

[piojanu]

Hi!

I tried to run your CartPole Jupyter notebook example. However, I run into this problem:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-4-aa80e5b7db85> in <module>()
      1 dt = 0.05
      2 pole_length = 1.0
----> 3 dynamics = CartpoleDynamics(dt, l=pole_length)

6 frames
/usr/local/lib/python3.7/dist-packages/theano/compile/function/pfunc.py in _pfunc_param_to_in(param, strict, allow_downcast)
    541     elif isinstance(param, In):
    542         return param
--> 543     raise TypeError(f"Unknown parameter type: {type(param)}")
    544 
    545 

TypeError: Unknown parameter type: <class 'theano.tensor.var.TensorVariable'>

I run it in colab. I installed your package this way: !pip install -U git+https://github.com/anassinator/ilqr.git. I tried to force install Theano == 1.0.4, but it didn't help.

Can you please help me figure this out?

Thanks, Piotr

[piojanu]

There is the same problem in the Pendulum example, so it's not CartPole dependent.

[anassinator]

This seems like a colab-specific problem. Maybe try running it locally or follow some of the instructions here:

• https://github.com/pymc-devs/pymc/issues/4468
• https://stackoverflow.com/questions/47124427/theano-typeerror-unknown-parameter-type-class-tensorflow-python-framework-o

This package isn't actively maintained BTW.