[MRG+1] UnaryEncoder to encode ordinal features into unary levels#8652

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arjunjauhari wants to merge 15 commits intoscikit-learn:masterfrom

arjunjauhari:ordinal-encoder

Commits on Nov 28, 2017

Rebase and commit the OrdinalEncoder implementation
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Updating name to UnaryEncoder and adding single quote in error string
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Merged changes from #9216

ruxandraburtica
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Commits on Nov 29, 2017

Removing active_features_ attribute from UnaryEncoder as it is not needed
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Limiting the lines in documentation to less that 80 chars
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Updated documentation. Changed the default value of sparse parameter to False
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Commits on Nov 30, 2017

Updated test cases to accomodate change in default value of sparse parameter. Also added a new test case test_unary_encoder_n_values_array
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Commits on Dec 1, 2017

Commits on Dec 3, 2017

Refactoring the code. Now fit_transform in equivalent to fit +
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Commits on Dec 4, 2017

Commits on Dec 18, 2017

Fixing concerns.
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Commits on Dec 19, 2017

Resolved conflicts with master
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