Implementation of tanh and sigm

[ghost]

DeepCode's analysis on #b8365e found:

• :warning: 2 warnings :point_down:

  Top issues

Description	Example fixes
The result of calloc, which may return null flows to the first argument of memcpy. This could result in undefined behavior. Consider adding a check for nullness. Occurrences: relaxation.cpp:187 fp_mat.cpp:16	:wrench: Example fixes
Memory leak. Memory is never freed if realloc fails to allocate memory. Occurrences: decomposition.cpp:27 decomposition.cpp:35 decomposition.cpp:116	:wrench: Example fixes

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[deepcodeappdev[bot]]

DeepCode's analysis on #b8365e found:

• :warning: 2 warnings :point_down:

  Top issues

Description	Example fixes
The result of calloc, which may return null flows to the first argument of memcpy. This could result in undefined behavior. Consider adding a check for nullness. Occurrences: fp_mat.cpp:16 relaxation.cpp:187	:wrench: Example fixes
Memory leak. Memory is never freed if realloc fails to allocate memory. Occurrences: decomposition.cpp:27 decomposition.cpp:35 decomposition.cpp:116	:wrench: Example fixes

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