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package org.apache.mahout.math;

Marker interface for vectors that may cache their squared length.
interface LengthCachingVector {
Gets the currently cached squared length or if there is none, recalculates the value and returns that.

The sum of the squares of all elements in the vector.
  double getLengthSquared();

Invalidates the length cache. This should be called by all mutators of the vector.
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