sample_train data size from 36400-364000, generated by 'rand_samp.py'
the data comes from the first 1/6 part of the entire dataset, the time
span is from OCT 21 12am to OCT 22 4am, this sample might be severely
biased, but let's just try out the models using these datasets, i ll try
to make a better sample set in a day or two