/// <summary>
/// Normalizes a sparse vector using the L2 norm.
/// </summary>
/// <param name="sparseVector">
/// The sparse vector.
/// </param>
/// <returns>
/// The normalized sparse vector
/// </returns>
private static SparseVector Normalize(SparseVector sparseVector)
{
var sumSquared = sparseVector.Inner(sparseVector);
if (sumSquared > 1e-10)
{
return((SparseVector)(sparseVector / Math.Sqrt(sumSquared)));
}
else
{
return(sparseVector);
}
}