C implementation of Contrastive Divergence (CD_k)

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I was trying to compare a C implementation of CD_k with other implementations usually written in Python, Matlab, etc. A naive C implementation (not in the repo) was much slower than its counterparts. Only by using additional libraries, such as openblas, one is able to remain competitive. Maybe it was obvious but, you know, programming is fun 😃

Only tested in Ubuntu & the like (Mint, etc)

Not very useful for large problems, since it computes explicitly the partition function.

Dependencies: openblas, gsl

sudo apt-get install libopenblas-dev

sudo apt-get install libgsl-dev

Compilation and execution:

gcc -std=gnu99 -Ofast -o rbm_openblas rbm_openblas.c -lm -lopenblas (ignore the warning on the return value of fscanf)

Data goes to stdout. Usage: ./rbm <input_data_file> foo

gcc -std=gnu99 -Ofast -o bars_and_stripes bars_and_stripes.c -lm -lgsl -lopenblas to compile a program that generates data for the bars and stripes problem

Data goes to stdout. Usage: ./bars_and_stripes <square linear dimension>

gcc -std=gnu99 -Ofast -o labeled_shifter_ensemble labeled_shifter_ensemble.c -lm -lgsl -lopenblas to compile a program that generates data for the labeled shifter ensemble problem

Data goes to stdout. Usage: ./labeled_shifter_ensemble <N> where size of each sample will be 2N+3

Not an example of good coding practices