[ADD] Option to specify number of data points #70
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At the moment, the number of data points is inferred by a pass through the data loader.
This can become a bottleneck on compute clusters when multiple jobs access the same data set in parallel (experience from a recent ICML submission on the Vector cluster).
To resolve this, the PR adds an optional argument
num_data
to all non-experimental linear operators which allows to avoid the data set traversal.