code: def my_matmul(a, b, c):
      c.copyfrom(np.dot(a.numpy(), b.numpy()))
  
imports: import tvm
  import tvm.testing
  from tvm import te
  from tvm.script import tir
  import numpy
  from tvm.tir.schedule.testing import assert_structural_equal_ignore_global_symbol
label_desc: Use image node_id 1 for calling a global function with example usage: my_matmul(a, b, c) without return types