Add numpy_modules.py and Add Neural Network Solvers in numpy_backend.py and Add numpy's examples in neural_solvers.py……

[heatingma]

1、Add numpy_modules.py 2、Add Neural Network Solvers in numpy_backend.py 3、Add numpy's examples in neural_solvers.py 4、Add 'numpy' in test_neural_solvers.py 5、Change download in utils.py 6、Update gamgm'numpy's example in multi_graph_solvers.py 7、Add 'wget>=3.2' in setup.py 8、Add 'wget' in requirements.txt

[codecov[bot]]

Codecov Report

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