Reduce overhead of Scalar python implementation

pytensor/scalar/basic.py

@@ -36,7 +36,6 @@ from pytensor.printing import pprint
 from pytensor.utils import (
     apply_across_args,
     difference,
-    from_return_values,
     to_return_values,
 )
 
@@ -1081,6 +1080,16 @@ def real_out(type):
     return (type,)
 
 
+def _cast_to_promised_scalar_dtype(x, dtype):
+    try:
+        return x.astype(dtype)
+    except AttributeError:
+        if dtype == "bool":
+            return np.bool_(x)
+        else:
+            return getattr(np, dtype)(x)
+
+
 class ScalarOp(COp):
     nin = -1
     nout = 1
@@ -1134,28 +1143,18 @@ class ScalarOp(COp):
         else:
             raise NotImplementedError(f"Cannot calculate the output types for {self}")
 
-    @staticmethod
-    def _cast_scalar(x, dtype):
-        if hasattr(x, "astype"):
-            return x.astype(dtype)
-        elif dtype == "bool":
-            return np.bool_(x)
-        else:
-            return getattr(np, dtype)(x)
-
     def perform(self, node, inputs, output_storage):
         if self.nout == 1:
-            dtype = node.outputs[0].dtype
-            output_storage[0][0] = self._cast_scalar(self.impl(*inputs), dtype)
+            output_storage[0][0] = _cast_to_promised_scalar_dtype(
+                self.impl(*inputs),
+                node.outputs[0].dtype,
+            )
         else:
-            variables = from_return_values(self.impl(*inputs))
-            assert len(variables) == len(output_storage)
             # strict=False because we are in a hot loop
             for out, storage, variable in zip(
-                node.outputs, output_storage, variables, strict=False
+                node.outputs, output_storage, self.impl(*inputs), strict=False
             ):
-                dtype = out.dtype
-                storage[0] = self._cast_scalar(variable, dtype)
+                storage[0] = _cast_to_promised_scalar_dtype(variable, out.dtype)
 
     def impl(self, *inputs):
         raise MethodNotDefined("impl", type(self), self.__class__.__name__)