added calc_update() co-routine to hebbian-syn component

Author: Alexander Ororbia

ngclearn/components/synapses/hebbian/hebbianSynapse.py

@@ -221,6 +221,24 @@ def _compute_update(
             post_wght=post_wght)
         return dW, db
 
+    @compilable
+    def calc_update(self):
+       # Get the variables
+        pre = self.pre.get()
+        post = self.post.get()
+        weights = self.weights.get()
+        biases = self.biases.get()
+        opt_params = self.opt_params.get()
+
+        ## calculate synaptic update values
+        dWeights, dBiases = HebbianSynapse._compute_update(
+            self.w_bound, self.is_nonnegative, self.sign_value, self.prior_type, self.prior_lmbda, self.pre_wght, self.post_wght,
+            pre, post, weights
+        )
+
+        self.dWeights.set(dWeights)
+        self.dBiases.set(dBiases)
+
     @compilable
     def evolve(self):
         # Get the variables