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catalyst/zipline/utils
Nathan Wolfe 4865ade9b2 ENH: Add fast "vectorized" minute_to_session_label for DatetimeIndex
The new TradingCalendar method is called `minute_index_to_session_labels`.
It takes a DatetimeIndex of in-order market minutes and returns a
DatetimeIndex of the corresponding sessions.

The new method is approximately 100x faster than mapping
`minute_to_session_label` over a large DatetimeIndex.
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