The tag sampling tells me that,
Creating samples from a well-specified population using a probabilistic method and/or producing random numbers from a specified distribution.
Now, the question becomes: what is
Suppose, I am implementing a classifier.
I have a set of training data in the file
train.txt, and a set of test data in the file
What element can be termed as 'Sample', and what activity can be termed as 'Sampling' in this case?