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Implementation of linear-chain Conditional Random Fields (CRF) in pure Java

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package com.asher_stern.crf.utilities;

import static com.asher_stern.crf.utilities.ArithmeticUtilities.*;

import java.math.BigDecimal;

/**
 * A collection of linear algebra functions over vectors.
 * 
 * @author Asher Stern
 * Date: Nov 7, 2014
 *
 */
public class VectorUtilities
{
	/**
	 * Returns the inner product of the two given vectors.
	 * @param rowVector
	 * @param columnVector
	 * @return
	 */
	public static BigDecimal product(BigDecimal[] rowVector, BigDecimal[] columnVector)
	{
		if (rowVector.length!=columnVector.length) throw new CrfException("Cannot multiply vector of different sizes.");
		BigDecimal ret = BigDecimal.ZERO;
		for (int i=0;i