about psdlsh.cpp and create_test_data.cpp

[zmypla]

when I use your LSHBOX, i meet some problem.
link https://github.com/RSIA-LIESMARS-WHU/LSHBOX#for-python
i use create_test_data.cpp to create the test file, and use psdlsh.cpp to get the hash val,
but there are some abnormal thing:
RECALL : 1 +/- 0
COST : 1 +/- 0
and all the data[i]'s hash val is 0.