code: def matmul_plain_ix1(self):
      getattr(self.ea, "matmul_plaintext_ix1_f64")(self.d)
  
imports: import pytest
  import operator
  import os
  import numpy
  import phe
label_desc: Use image node_id 12 for calling the BenchSuite obj's underlying member method code with example usage: obj.matmul_plain_ix1() without return types