PERF: Prevent using copy in astype if not needed#4575

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jrings wants to merge 6 commits intoscikit-learn:masterfrom

Commits on Apr 11, 2015

ENH: First batch of astype conversions
jrings
committed
ENH: Rest of astype replacements where copy was not necessary
jrings
committed
Update stochastic_gradient.py
Joerg Rings
committed
FIX: Np astype for sparse matrices
Joerg Rings
committed

Commits on Apr 25, 2015