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* Use PyTorch's TestCase to compare tensor

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* Update test_energies.py

* Update test_ase.py

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* flake8

This reverts commit bd9d888a.

* Use PyTorch autograd's hessian

* fix test

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* clean

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* drop hessian from jit example

* Add warning to ChemicalSymbolsToInts

* Change ocurrences of ChemicalSymbolsToInts in the code to reflect safe usage

* flake8

* Add warning to call also

* Add clarification

* docs dont fetch magic functions so documentation is moved to the class docstring

* fix clarification

* flake8

* Support jit hessian

* fix

* fix

* Support len in ChemicalSymbolsToInts

* fix

* flake8