remove unused variables (#4096)

Author: MarcoGorelli

pymc3/distributions/continuous.py

@@ -4020,7 +4020,6 @@ def logp(self, value):
         -------
         TensorVariable
         """
-        sigma = self.sigma
         mu = self.mu
         tau = self.tau
         return bound(

pymc3/distributions/transforms.py

@@ -147,7 +147,6 @@ def __init__(self, dist, transform, *args, **kwargs):
             arguments to Distribution"""
         forward = transform.forward
         testval = forward(dist.default())
-        forward_val = transform.forward_val
 
         self.dist = dist
         self.transform_used = transform

pymc3/smc/smc.py

@@ -341,7 +341,6 @@ def __init__(
         self.observations = self.sum_stat(observations)
 
     def posterior_to_function(self, posterior):
-        model = self.model
         var_info = self.var_info
 
         varvalues = []