Multi label base architecture (#507)

* add : `MultiLabelCM` base.

* add : `__mlcm_assign_classes__` and `__mlcm_vector_handler__`.

* log : changes logged.

* pep8 : autopep8ed.

* replace : functions moved to `pycm_multilabel_cm.py`.

* update : `__mlcm_vector_filter__` added as a wraper.

* add : `MultiLabelCM` added to `__init__`.

* update : `MultiLabelCM` updated.

* update : base architecture completed.

* fix : removed extra `print`.

* change : `MultiLabelCM.__len__` changed to classes' length.

* fix : `MultiLabelCM.__str__` docstring added.

* add : `actual_vector_multihot` and `predict_vector_multihot`.

* fix : docstring fixed.

* fix : `MultiLabelCM` class docstring fixed.

* remove : extra import removed.

* fix : docstring fixed.

* add : `pycmIndexError` and `pycmNotWorkingError`.

* add : `classwise_cm` and `samplewise_cm` methods.

* test : tests added for `MultiLabelCM`.

* log : changes logged.

* add : new line added.

* rename : `S` -> `input_set` in `__set_to_multihot__`.

* edit : `__str__` updated.

* add : `pycmMultiLabelError` added and extra error classes removed.

* change : support for multi-hop input removed.

* test : tests added.

* fix : verified tests updated

* fix : multilabel tests updated

* fix : multilabel tests updated

* fix : an error message fixed to generlize the error condition.

* rename : `samplewise_cm` -> `get_cm_by_sample`.

* rename : `classwise_cm` -> `get_cm_by_class`.

* doc : multilabel document updated

* doc : README updated

* doc : minor edit in Document

* doc : CHANGELOG updated

* fix : docstring fixed.

* fix : meeting's comment applied.

* test : tests added.

* doc : multilabel document updated

* doc : README updated

* doc : minor bug in Document fixed

* fix : minor edit in multilabel tests

* doc : multilabel output added to README

* doc : Document input-error section updated

---------

Co-authored-by: sepandhaghighi <sepand.haghighi@yahoo.com>

CHANGELOG.md

@@ -6,9 +6,18 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 ### Added
+- `pycmMultiLabelError` class
+- `MultiLabelCM` class
+- `get_cm_by_class` method
+- `get_cm_by_sample` method
+- `__mlcm_vector_handler__` function
+- `__mlcm_assign_classes__` function
+- `__mlcm_vectors_filter__` function
+- `__set_to_multihot__` function
 - `deprecated` function
 ### Changed
 - Document modified
+- `README.md` modified
 - Example-4 modified
 - Test system modified
 - Python 3.5 support dropped