FIX: Unit testing for Jax/TensorFlow cost functions. #95
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In this commit:
* Unit testing added for Jax/TensorFlow cost functions and gradients
* Unit testing resulted in making several fixes to ensure stability of calculated gradients of Jax/TensorFlow by substituting automatic differentiation with evaluating the gradient with the explicit form like in SciPy engine.
* TensorFlow engine convergence criteria relaxed to max_iterations = 100 and < 0.1% change in cost function. Output results were shown to be insensitive to this change with much faster convergence.
The added unit testing and fixes addresses issue #94.