[bug report] When extracting multiple features with extract_features the first batch contains only features of the last blob

[mlapin]

Looks like it hasn't been fixed yet...

In

tools/extract_features.cpp

instead of (L137-139)

  vector<shared_ptr<leveldb::WriteBatch> > feature_batches(
      num_features,
      shared_ptr<leveldb::WriteBatch>(new leveldb::WriteBatch()));

there should be something like

  vector<shared_ptr<leveldb::WriteBatch> > feature_batches(num_features);
  for (int i = 0; i < num_features; ++i) {
    feature_batches[i] = shared_ptr<leveldb::WriteBatch>(
      new leveldb::WriteBatch());
  }

Otherwise all blobs share the same WriteBatch and the last blob overwrites the other ones.

sorry - no PR

[shelhamer]

This should have been fixed by the data pipeline changes in #1238 if I remember right.