Updated Approximate nearest neighbors in neighbors.rst
Inlined generate_hash into create_tree in LSHForest.
Updated test_approximate.
Re-written Approximate nearest neighbors documentation.
FIX Moved random_state to fit method to pass seed to create_tree.
FIX Updated plots in example.
DOC Included information about distance measure and LSH method in the documentation.
Added test to check randomness of hash functions.
FIX Added integer as random_state to test_hash_functions.
Updated example to avoid redundants.
Example splitted into hyperparameters and scalability.
FIX Fixed accuracy error in scalability example.
DOC Added new section-Mathematical description of LSH.
Created benchmark for approximate nearest neighbors.
Added scalability plots into documentation.
FIX Modified tests to handle cosine distances instead or euclidean.
Updated example with cosine measures.
Modified plots in hyper-parameters and scalability plots.
FIX Added user warnings for insufficient candidates.
Changed parameter descriptions of LSHForest.