- state load/save revised

- num gibbs samples is also part of entity
- working 3-layer deep test model

src/rbm/layer.py

@@ -13,13 +13,10 @@ class Layer:
 		self.entity.state.init(mu=0, std=std)
 
 	def save(self, filename: str = None):
-		self.entity.state.to_file(filename)
+		self.entity.state.save(filename)
 
 	def load(self, filename: str = None):
-		state = RbmState.from_file(filename)
-		if state is not None:
-			self.entity.state = state
-
+		self.entity.state.load(filename)