- improved cd_hinton()

- uniform() returns vector

source/Rbm.cpp

@@ -17,7 +17,7 @@
 
 using namespace Matutils;
 
-#define USE_CD_HINTON 0
+#define USE_CD_HINTON 1
 
 Rbm::Rbm(size_t numVisible, size_t numHidden)
 : m_params()
@@ -97,9 +97,9 @@ void Rbm::weightsAssign(const arma::mat& w, const arma::mat& bh, const arma::mat
 
 void Rbm::weightsInit(double stddev, double mu)
 {
-	uniform(m_whv, stddev, mu);
-	uniform(m_bh, 0, mu);
-	uniform(m_bv, 0, mu);
+	m_whv = uniform(m_whv, stddev, mu);
+	m_bh = uniform(m_bh, 0, 0);
+	m_bv = uniform(m_bv, 0, 0);
 }
 
 void Rbm::fromJson(Json::Value rbm)
@@ -190,7 +190,14 @@ void Rbm::cd_hinton(arma::mat const &v_data, arma::mat &dw, arma::mat &dbh, arma
 
 	if (m_params.doGaussianHidden)
 	{
-		poshidstates = poshidprobs + arma::randn(arma::size(poshidprobs));
+		if (m_params.gibbsDoSampleHidden)
+		{
+			poshidstates = poshidprobs + arma::randn(arma::size(poshidprobs));
+		}
+		else
+		{
+			poshidstates = poshidprobs;
+		}
 	}
 	else
 	{
@@ -212,7 +219,15 @@ void Rbm::cd_hinton(arma::mat const &v_data, arma::mat &dw, arma::mat &dbh, arma
 	for (int i=0; i < m_params.numGibbs; i++)
 	{
 		// Start negative phase	
-		arma::mat negdata = toVisibleProbs(poshidstates);
+		arma::mat negdata;
+		if (m_params.gibbsDoSampleHidden)
+		{
+			negdata = toVisibleProbs(sample(poshidstates));
+		}
+		else
+		{
+			negdata = toVisibleProbs(poshidstates);
+		}
 		arma::mat neghidprobs;
 		if (m_params.gibbsDoSampleVisible)
 		{
@@ -226,14 +241,7 @@ void Rbm::cd_hinton(arma::mat const &v_data, arma::mat &dw, arma::mat &dbh, arma
 		neghidact = arma::sum(neghidprobs);
 		negvisact = arma::sum(negdata);
 
-		if (m_params.gibbsDoSampleHidden)
-		{
-			poshidprobs = sample(neghidprobs);
-		}
-		else
-		{
-			poshidprobs = neghidprobs;
-		}
+		poshidprobs = neghidprobs;
 	}
 	// Update weight deltas
 	dw = posprods - negprods;

source/matutils.hpp

@@ -21,40 +21,15 @@
 namespace Matutils
 {
 	const size_t NORMALIZING_DIM = 1;
-	inline void uniform(arma::mat& srcDst, double stdDev=1.0, double mu=0.5)
+	inline arma::mat uniform(arma::mat const & sizeMat, double stdDev=1.0, double mu=0.5)
 	{
-	#if 0
-		for (size_t i=0; i < srcDst.n_rows; i++)
-		{
-			for (size_t j=0; j < srcDst.n_cols; j++)
-			{
-				srcDst(i, j) = stdDev*(Noise_Uniform(&m_noise) + mu - 0.5);
-			}
-		}
-	#else
-		srcDst = stdDev*(arma::randu(arma::size(srcDst)) + mu - 0.5);
-	#endif
+		return stdDev*(arma::randu(arma::size(sizeMat)) + mu - 0.5);
 	}
 
 	inline arma::mat sample(const arma::mat &src)
 	{
-		arma::mat rand = src;
-		uniform(rand);
-
-	#if 0
-		for (size_t i=0; i < src.n_rows; i++)
-		{
-			for (size_t j=0; j < src.n_cols; j++)
-			{
-				dst(i, j) = src(i, j) >= dst(i, j);
-			}
-		}
-		return dst;
-	#else
-		arma::umat res = (src > rand);
+		arma::umat res = (src > uniform(src));
 		return arma::conv_to<arma::mat>::from(res);
-
-	#endif	
 	}
 	
 	inline arma::mat prob(const arma::mat &src)