Returns a map of `FunctionName: FunctionClass`

def inspect_functions(self):
        """ Returns a map of `FunctionName: FunctionClass` """
        if not self._inspect_functions:
            d = {}
            for m in self.inspect_members:
                if issubclass(m, AWSHelperFn):
                    d[m.__name__] = m

            TemplateGenerator._inspect_functions = d

        return self._inspect_functions