class_docstr: Visitor to locate op on an AST.
class_docstr_tok: ["Visitor","to","locate","op","on","an","AST","."]
code: def __init__(self):
      self.counter = -1
      self.op2nodes = {}
      super().__init__()
  
imports: import tvm
  from tvm import relay
  from tvm.relay import op, transform
  from tvm.relay import ExprMutator
label_desc: Use image node_id 1 to create a new ExprLocator object from inherited base classes: ExprMutator with example: obj = ExprLocator()