static Similarity()
{
{
for (int i = 0; i < 256; i++)
{
NORM_TABLE[i] = SmallFloat.Byte315ToFloat((byte)i);
}
}
}
/// <summary>Encodes a normalization factor for storage in an index.
///
/// <p/>The encoding uses a three-bit mantissa, a five-bit exponent, and
/// the zero-exponent point at 15, thus
/// representing values from around 7x10^9 to 2x10^-9 with about one
/// significant decimal digit of accuracy. Zero is also represented.
/// Negative numbers are rounded up to zero. Values too large to represent
/// are rounded down to the largest representable value. Positive values too
/// small to represent are rounded up to the smallest positive representable
/// value.
///
/// </summary>
/// <seealso cref="Mono.Lucene.Net.Documents.Field.SetBoost(float)">
/// </seealso>
/// <seealso cref="Mono.Lucene.Net.Util.SmallFloat">
/// </seealso>
public static byte EncodeNorm(float f)
{
return((byte)SmallFloat.FloatToByte315(f));
}
