auto handle_op = find_op.getTableHandle().getDefiningOp();
    if (handle_op == nullptr) return failure();
    auto hashtable_op = llvm::dyn_cast<TFL::HashtableOp>(handle_op);
    if (hashtable_op == nullptr) return failure();
    rewriter.replaceOpWithNewOp<TFL::HashtableFindOp>(
        find_op, find_op->getResultTypes(), find_op.getTableHandle(),
        find_op.getKeys(), find_op.getDefaultValue());

        // asset filepath.
        builder.setInsertionPoint(init_op);
        builder.create<TF::InitializeTableFromTextFileV2Op>(
            init_op.getLoc(), init_op.getTableHandle(), const_op.getResult(),
            init_op.getKeyIndex(), init_op.getValueIndex(),
            init_op.getVocabSize(), init_op.getDelimiter());
        init_op.erase();
      }
    }

        op.getLoc(), rewriter.getI64TensorAttr(line_nums));

    // Replace the given op with LookupTableImportV2Op.
    rewriter.create<LookupTableImportV2Op>(op.getLoc(), op.getTableHandle(),
                                           key_constant_tensor,
                                           value_constant_tensor);
    rewriter.eraseOp(op);
    return success();
  }

 private: