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--HG--
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matrix cache more efficiently.

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compute the inner_product() of kcentroids as well as a few
other useful things.

--HG--
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--HG--
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--HG--
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--HG--
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--HG--
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--HG--
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--HG--
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--HG--
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--HG--
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--HG--
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--HG--
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--HG--
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lu_decomposition::is_singular() function to avoid what appears to be a
bug in gcc 4.2.4 that caused one of the regression tests to segfault
when built with -O3.

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to get the corner points.

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(See bug #2600378)

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--HG--
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potential compiler warnings.

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appropriate.

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--HG--
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to some macro.

--HG--
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--HG--
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--HG--
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    being called from the destructor of a global object when the state object
    the unregister_thread_end_handler() function uses has already been destroyed.
  - Changed the thread pool so that it only gets destroyed if there aren't any
    outstanding threads when the program ends.  If there are threads still
    running user tasks then the thread pool never attempts to destruct.

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to unregister_thread_end_handler().  What could happen in some scenarios is,
during program termination, a global part of the logger object could be destructed
when it still had outstanding thread end handlers registered to it.

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--HG--
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--HG--
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--HG--
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--HG--
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--HG--
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--HG--
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--HG--
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