Mercurial > pylearn
view sparse_instance.py @ 489:bb6bdd3b7ff3
Another bit of documentation
author | Joseph Turian <turian@gmail.com> |
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date | Tue, 28 Oct 2008 03:31:36 -0400 |
parents | 217c8789284b |
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""" Sparse instances. Each instance is represented as dict with key dimension. Dimensions not present in the dict have value 0. """ from numpy import zeros def to_vector(instances, dimensions): """ Convert sparse instances to vectors. @type instances: list of sparse instances @param dimensions: The number of dimensions in each instance. @rtype: numpy matrix (instances x dimensions) @todo: Allow this function to convert SINGLE instances (not lists). """ v = zeros((len(instances), dimensions)) l = len(instances) for i in range(l): for idx in instances[i].keys(): v[i][idx] = instances[i][idx] return v