Code bug(memory leaks)

[fabulousfeng]

~MaybeStaticArray() (hierarchical_softmax.cc:316)
Mismatched free() / delete / delete [] is detected by Valgrind.
delete dynamic_array;
should be replaced by
delete [] dynamic_array;
since you defined new T[dynamic_size] in the constructor.
This may cause undefined behavior.

[fabulousfeng]

@akhti