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Merge branch 'dev' of https://github.com/pgmpy/pgmpy into dev
edited docs for Factor class [refs #137]
Corrected tests for factor product and reduce according to the new representation of the factor class [refs #137]
Adds an extra check for the size of variables and cardinality. Earlier even if the size of variables and cardinality were not same the Factor object was created
corrected tests according to the new representation of Factor class #137
corrected marginalize function according to the new representation of Factor
improved the _marginalize_single_variable method [refs #137]
Merge pull request #168 from ankurankan/dev

Changed marginalize function according to new representation