<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_output_from_input(self):
 """Populate output form with default output path based on input layer. """

        input_path = self.layer.currentLayer().source()
        output_path = (
            os.path.splitext(input_path)[0] + '_multi_buffer'
            + os.path.splitext(input_path)[1])
        self.output_form.setText(output_path)