def train(self, data_matrix, label_matrix):
self.D = data_matrix
self.Y = label_matrix
num_feature_vectors = num_rows(self.D)
num_features= num_columns(self.D)
num_outputs = num_columns(self.Y)
#initialize b
for _ in range(num_outputs):
self.b.append(0.0)
#initialize M
for _ in range(num_outputs):
row = list()
for _ in range(num_features):
row.append(0.1*normalvariate(0,1))
self.M.append(row)
#maintain an array on indices of f.v which will be shuffled each time
indices = list()
for i in range(num_feature_vectors):
indices.append(i)
num_folds= 0.05
for i in range(20):
shuffle(indices)
for i in range(num_feature_vectors):
for j in range(num_outputs):
e = self.Y[indices[i]][j] - (dot_prod(self.D[indices[i]], self.M[j]) + self.b[j])
self.b[j] += num_folds*e
for components in range(num_features):
self.M[j][components] += num_folds*e*self.D[indices[i]][components]
num_folds *= .85
def train(self, indices):
num_outputs = len(self.D[0][-1])
num_features= num_columns(self.D)-1
#initialize b
self.b=[]
for i in range(num_outputs):
self.b.append(0.0)
#initialize M
self.M=[]
for _ in range(num_outputs):
row = list()
for i in range(num_features):
if i in self.nom_cols:
row.append(0.1*normalvariate(0,1))
if i in self.cat_cols:
row.append( self.cat_cols[i][choice(self.cat_cols[i].keys())])
self.M.append(row)
#print 'before:', self.M
#maintain an array on indices of f.v which will be shuffled each time
num_folds= 0.05
for i in range(10):
for i in indices:
for j in range(num_outputs):
predicted = 0
for components in range(num_features):
if components in self.nom_cols:
predicted += self.D[i][components]*self.M[j][components]
if components in self.cat_cols:
predicted += dot_prod(self.D[i][components], self.M[j][components])
predicted += self.b[j]
e = self.D[i][-1][j] - predicted
self.b[j] += num_folds*e
for components in range(num_features):
if components in self.nom_cols:
self.M[j][components] += num_folds*e*self.D[i][components]
if components in self.cat_cols:
self.M[j][components] = vector_addition(self.M[j][components], scalar_prod(num_folds*e, self.D[i][components]))
num_folds *= .85