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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

* cleanup after test_vibrational to avoid .pckl files everywhere

* only dump test_neurochem's runs into torchani/tests

* avoid runs inside tests/

* Add coverage to gitignore

* consts is unnecessary here

* Add force constants, reduced masses and normalized normal modes to vibrational analysis

* Formatting to make flake8 happy