Python dtanh示例

示例#1

文件： RAE.py 项目： jbelanich/RAE

	def backprop(self, params, sentence):
		"""
		Calculate delta values depending place in tree.
		"""

		#backprop doesn't need to calculate deltas for leaves
		if self.isLeaf():
			return

		(W1,b1,W2,b2,Wlabel) = self.params
		W2top = W2[0:100,:]
		W2bottom = W2[100:200,:]
		W1left = W1[:,0:100]
		W1right = W1[:,100:200]
		leftWeight = float(self.c1.numLeaves() + 1)/(self.c1.numLeaves() + self.c2.numLeaves() + 2)
		rightWeight = float(self.c2.numLeaves() + 1)/(self.c1.numLeaves() + self.c2.numLeaves() + 2)

		if self.isRoot():
			self.delta = -util.dtanh(self.a) * (leftWeight*W2top.transpose().dot(self.c1.p - self.c1Prime)+ rightWeight * W2bottom.transpose().dot(self.c2.p - self.c2Prime))
		else:
			if self.isLeftChild():
				properW = W1left
			else:
				properW = W1right
			self.delta = util.dtanh(self.a) * (properW.dot(self.parent.delta))

		self.c1.backprop(params,sentence)
		self.c2.backprop(params,sentence)

示例#2

文件： RAE.py 项目： jbelanich/RAE

	def backpropAsRoot(self, params, sentence):
		"""
		Calculate delta values depending place in tree,
		pretending this node is the root and moving on down.
		"""
		(W1,b1,W2,b2,Wlabel) = self.params
		W2top = W2[0:100,:]
		W2bottom = W2[100:200,:]
		leftWeight = float(self.c1.numLeaves() + 1)/(self.c1.numLeaves() + self.c2.numLeaves() + 2)
		rightWeight = float(self.c2.numLeaves() + 1)/(self.c1.numLeaves() + self.c2.numLeaves() + 2)

		self.delta = -util.dtanh(self.a) * (leftWeight*W2top.transpose().dot(self.c1.p - self.c1Prime)+ rightWeight * W2bottom.transpose().dot(self.c2.p - self.c2Prime))

		self.c1.backprop(params,sentence)
		self.c2.backprop(params,sentence)