metadata.total_size = size_expr;          \
    break;

    SINGLE_CASE(kS, TF_ATTR_STRING, attr->s().length());
    SINGLE_CASE(kI, TF_ATTR_INT, -1);
    SINGLE_CASE(kF, TF_ATTR_FLOAT, -1);
    SINGLE_CASE(kB, TF_ATTR_BOOL, -1);
    SINGLE_CASE(kType, TF_ATTR_TYPE, -1);
    SINGLE_CASE(kShape, TF_ATTR_SHAPE,
                attr->shape().unknown_rank() ? -1 : attr->shape().dim_size());

      break;
    case tensorflow::AttrValue::kF:
      TFE_OpSetAttrFloat(op, attr_name, default_value.f());
      break;
    case tensorflow::AttrValue::kB:
      TFE_OpSetAttrBool(op, attr_name, default_value.b());
      break;
    case tensorflow::AttrValue::kType:
      TFE_OpSetAttrType(op, attr_name,

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