Fix imports

doc/notebooks/02_tutorial_basic_kernels.ipynb

@@ -917,4 +917,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 2
-}
+}
\ No newline at end of file

pystencils/cpu/vectorization.py

@@ -270,7 +270,7 @@ def insert_vector_casts(ast_node, instruction_set, default_float_type='double'):
             new_arg = visit_expr(expr.args[0], default_type)
             base_type = get_type_of_expression(expr.args[0]).base_type if type(expr.args[0]) is VectorMemoryAccess \
                 else get_type_of_expression(expr.args[0])
-            pw = sp.Piecewise((-new_arg, new_arg < cast_func(0, base_type.numpy_dtype)),
+            pw = sp.Piecewise((-new_arg, new_arg < CastFunc(0, base_type.numpy_dtype)),
                               (new_arg, True))
             return visit_expr(pw, default_type)
         elif expr.func in handled_functions or isinstance(expr, sp.Rel) or isinstance(expr, BooleanFunction):