* Added predicate_symbols

* Added FOIL

* Updated README

* Added tests for search.py

* Updated readme

* Removed extra newline

* Fixed seed

* Update README.md

* Added docstring for minimal-consistent-det

* add a simple naive bayes classifier

* Update test_learning.py

* spacing

* minor fix

* lists to strings

* Update nlp.py

* add chart parsing test

* add chart parsing section

* add cnf_rules to grammar

* Update nlp.ipynb

* Update test_nlp.py

* add more to CNF section

* Update nlp.py

* add CYK parsing test

* add prob-grammar to notebook

* Update nlp.py

* add weighted choice

* tests for prob grammar + generation

* add test for weighted choice

* Update nlp.py

* Update knowledge.ipynb

* Update test_knowledge.py

* add version-space learner + small fix

* add test for version-space learner + trivial example

* Update README.md

* Update nlp.py

* Update test_nlp.py

* Add files via upload

* Update nlp.ipynb

* add generate_random

* Update README.md

* add powerset to utils

* add powerset test

* Create knowledge.py

* Create test_knowledge.py

* add header docstring to knowledge.py

* update learning docstring

* minor edits in knowledge.py

* Fixed truncated_svd

* Moved SVD algorithm to learning.py

* Minor fixes

* Typo fix

* Update nlp.py

* Update test_nlp.py

* Update nlp.ipynb

* Update text.py

* Update test_text.py

* Update text.ipynb

* 'sentences' to 'samples'

* Added pl_resolution to notebook

* Added pl_resolution and FolKB to notebook

* Update logic.py

* unigram char model + rename text to word models

* Update test_text.py

* Update text.ipynb

* remove duplicate assert

* add RandomVacuumAgent + CompareAgents

* set random.seed

* Update test_learning.py

* Update learning.py

* Removes smalltest_kb

* Moved wumpus_kb to logic.py

* Added PropKB and tt_entails to notebook

* Update agents.py

* Update test_agents.py

* Add bidirectional search + update h function

* add bidirectional search test

* Update search.py

* Update test_search.py

* DataFile Update

* Update learning.py

* Update search.py

* Update test_learning.py

* Update test_text.py

* Add files via upload

* Update text.ipynb

* Update search-4e.ipynb

* Create CONTRIBUTING.md

* Update games.py

* Create test_games.py

* Create games.ipynb

* Added test for fol_fc_ask()

* Optimization of fol_fc_ask()

* Faster fol_fc_ask()

* Removed subst for rules in KB

* Delete test_grid.py

* Delete grid.ipynb

* Delete grid.py

* Move grid functions to utils

* Move grid tests to utils

* Update agents.py

* Update mdp.py

* Update search.py

* Update search.py

* Update test_search.py

* Create function to initialize random weights

* Add sigmoid derivative function

* Update csp.py

* Add test

* Update learning.ipynb

* Update test_learning.py

* Resolve conflicts