case AttrValue::kB:
      return builder->getBoolAttr(value.b());
    case AttrValue::kType: {
      mlir::Type type;
      TF_RETURN_IF_ERROR(ConvertDataType(value.type(), *builder, &type));
      return mlir::TypeAttr::get(type);
    }
    case AttrValue::kShape:
      return ConvertTensorShapeProto(value.shape(), builder->getContext());
    case AttrValue::kTensor:
      return ConvertTensorProto(value.tensor(), builder);

// before the op being constant folded. Since the constant
// folding logic will use a "arith.constant" op to replace the
// "tf.FakeQuantWithMinMaxVarsOp", the "quant.qcast" op is used to preserve
// the quantization parameters as a TypeAttr and "quant.dcast" op used to
// convert the output type to the next op. Here are the transformations:
//
// input   min cst       max cst              input
//  \       |             |                     |

// before the op being constant folded. Since the constant
// folding logic will use a "arith.constant" op to replace the
// "tf.FakeQuantWithMinMaxVarsOp", the "tfl.quantize" op is used to preserve
// the quantization parameters as a TypeAttr and "tfl.dequantize" op used to
// convert the output type to the next op. Here are the transformations:
//
// input   min cst       max cst          input   min cst       max cst

          builder.setInsertionPoint(assign_variable_op);
          auto new_q_op = builder.create<QuantizeOp>(
              assign_variable_op.getLoc(), ref_qtype, dq_op.getInput(),
              TypeAttr::get(ref_qtype));
          auto new_assign_variable_op = builder.create<AssignVariableOp>(
              assign_variable_op.getLoc(), assign_variable_op.getResourceId(),
              new_q_op.getResult());

    if (input_types.size() <= 1) return;

    Type target_input_type = mlir::cast<TypeAttr>(input_types[0]).getValue();
    auto result_type = UnrankedTensorType::get(target_input_type);
    for (auto i = 1; i < input_types.size(); ++i) {
      Type current_input_type = mlir::cast<TypeAttr>(input_types[i]).getValue();
      if (current_input_type != target_input_type) {
        input_values[i] =

        returned_type = quant::ConvertSignedQuantizedToUnsigned(
            dequantize_input.getType(), dequantize_op.getLoc());
        // replace the dequantize op by a quantize op
        TypeAttr type_attr = TypeAttr::get(returned_type);
        auto quantize_op = builder.create<QuantizeOp>(
            dequantize_op.getLoc(), returned_type, dequantize_input, type_attr);
        returned_value = quantize_op.getOutput();

  }
}

mlir::Type GetShapeStrippedType(mlir::TypeAttr type_attr) {
  auto type = type_attr.getValue();
  auto shaped_type = mlir::dyn_cast<mlir::ShapedType>(type);
  if (shaped_type) {
    return shaped_type.getElementType();
  } else {
    return type;
  }
}

bool NotFromQuantOpOrSameQuantType(mlir::Value val, mlir::TypeAttr qtype_attr) {
  auto val_defn_op = val.getDefiningOp();

                       legacy_float_scale, use_fake_quant_num_bits);
  if (!final_type) return {};
  return TypeAttr::get(final_type);
}

TypeAttr CastQuantizedTypeAttrFromExpressedType(const Builder builder,
                                                const TypeAttr source,
                                                const Type target,
                                                const int axis) {

  Operation *op = value.getDefiningOp();
  if (op) {
    builder.setInsertionPoint(&block, ++Block::iterator(op));
  } else {
    builder.setInsertionPointToStart(&block);
  }
  TypeAttr type_attr = TypeAttr::get(new_type);
  auto quantize = builder.create<TFL::QuantizeOp>(value.getLoc(), new_type,
                                                  value, type_attr);
  auto dequantize = builder.create<TFL::DequantizeOp>(

    } else if (auto q = llvm::dyn_cast<quantfork::QuantizeCastOp>(op)) {
      auto out_type = q.getResult().getType();
      auto qcast = b.create<QuantizeOp>(q.getLoc(), out_type, q.getArg(),
                                        TypeAttr::get(out_type));
      q.getResult().replaceAllUsesWith(qcast);
      if (auto extra_attr = op->getAttr(mlir::quant::kVolatileOpAttrName)) {
        qcast->setAttr(mlir::quant::kVolatileOpAttrName, extra_attr);
      }