Method setReader

src/learner/sgd.h:109–113

  ~MinibatchReader() { }

  void setReader(const DataConfig& file, int minibatch_size, int data_buf = 1000) {
    reader_.init(file);
    minibatch_size_ = minibatch_size;
    data_prefetcher_.setCapacity(data_buf);
  }

  void setFilter(size_t n, int k, int freq) {
    filter_.resize(n, k);