ADD : cosinus kernel calculation in metrics/pairwise.py
add cos_kernel in help of decomposition/kernel_pca.py
name change: cos into cosine
change way of calculating cosine_kernel in metrics/pairwise.py
add test for cosine_kernel in metrics/test_pairwise.py
correct indent pb and re-edit cosine_kernel help in metrics/pairwise.py
fix style issue by running pep8 on metrics/pairwise.py and on metrics/tests/test_pairwise.py
remove duplicated test_cosine_kernel() in metrics/tests/test_pairwise.py
change test_cosine_kernel to include normalize from preprocessing.py in metrics/tests/test_pairwise.py
remove duplicated dimension check in metrics/pairwise.py
add reference to cosine similarity in cosine_kernel help from metrics/pairwise.py
modify cosine_kernel func to use normalize from preprocessing.py and change the test_cosine_kernel adding scipy.sparse inputs respectively in metrics/pairwise.py andmetrics/test_pairwise.py
modify test_cosine_kernel to compare result obtain with linear kernel in metrics/tests/test_pairwise.py
FIX: add prefix 'np.' to sqrt for test_cosine_kernel in metrics/tests/test_pairwise.py
FIX: move import of normalize function into the cosine_kernel call in metrics/pairwise.py
TST add cosine_kernel to kernel tests, pep8
ENH lazy import of metrics in base, not preprocessing in metrics.