moveforever commented on issue #18346:
URL:
https://github.com/apache/incubator-mxnet/issues/18346#issuecomment-630711491
i add some code from 3rdparty/dmlc-core to mxnet/src/io.
- 1. support multi-format features
1) i add std::vector<UnitData<IndexType> > extra(a data struct to support
multi-format features in a row) as followed. UnitData can support fixed length
features(dense features or one-categorical features), and also can support
variable length features(multi-hot features)
```c++
template<typename IndexType, typename DType = real_t>
class UnitData {
public:
/*! \brief length of the sparse vector */
size_t length;
/*!
* \brief index of each instance
*/
const IndexType *index;
/*!
* \brief array value of each instance, this can be NULL
* indicating every value is set to be 1
*/
const DType *value;
};
```
- support multi-label
1) we only add label_width
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