some errors when running train.lua

[PPeiMi]

Hi, I have some error after (https://github.com/jcjohnson/densecap/issues): libloadcaffe.so: undefined symbol: _ZN6google8protobuf8internal23empty_string_once_init_E

$ th train.lua -data_h5 output.HDF5 -data_json output.json -gpu 2
{
  finetune_cnn_after : -1
  weight_decay : 1e-06
  optim_beta2 : 0.999
  val_images_use : 1000
  timing : false
  optim_epsilon : 1e-08
  test_num_proposals : 1000
  input_encoding_size : 512
  losses_log_every : 10
  id : ""
  gpu : 2
  drop_prob : 0.5
  data_json : "output.json"
  clip_final_boxes : 1
  sampler_batch_size : 256
  rnn_size : 512
  test_rpn_nms_thresh : 0.7
  progress_dump_every : 100
  optim_beta1 : 0.9
  end_objectness_weight : 0.1
  seed : 123
  test_final_nms_thresh : 0.3
  eval_first_iteration : 0
  captioning_weight : 1
  checkpoint_start_from : ""
  sampler_high_thresh : 0.7
  mid_objectness_weight : 0.1
  data_h5 : "output.HDF5"
  train_remove_outbounds_boxes : 1
  sampler_low_thresh : 0.3
  debug_max_train_images : -1
  learning_rate : 1e-05
  rpn_hidden_dim : 512
  max_iters : -1
  checkpoint_path : "checkpoint.t7"
  save_checkpoint_every : 10000
  end_box_reg_weight : 0.1
  proposal_regions_h5 : ""
  backend : "cudnn"
  mid_box_reg_weight : 0.05
  box_reg_decay : 5e-05
}
DataLoader loading json file:   output.json 
DataLoader loading h5 file:     output.HDF5 
reading box_to_img  
reading boxes   
reading image_heights   
reading image_widths    
reading img_to_first_box    
reading img_to_last_box 
reading labels  
reading lengths 
reading original_heights    
reading original_widths 
reading split   
assigned 77396/5000/5000 images to train/val/test.  
initialized DataLoader: 
#images: 87396, #regions: 4062806, sequence max length: 15  
initializing a DenseCap model from scratch...   
/home/PPeiMi/torch/install/bin/luajit: /home/PPeiMi/torch/install/share/lua/5.1/trepl/init.lua:384: /home/PPeiMi/torch/install/share/lua/5.1/trepl/init.lua:384: /home/PPeiMi/torch/install/share/lua/5.1/loadcaffe/ffi.lua:10: /home/PPeiMi/torch/install/lib/lua/5.1/libloadcaffe.so: undefined symbol: _ZN6google8protobuf8internal23empty_string_once_init_E
stack traceback:
    [C]: in function 'error'
    /home/PPeiMi/torch/install/share/lua/5.1/trepl/init.lua:384: in function 'require'
    ./densecap/DenseCapModel.lua:21: in function '__init'
    /home/PPeiMi/.luarocks/share/lua/5.1/torch/init.lua:91: in function </home/PPeiMi/.luarocks/share/lua/5.1/torch/init.lua:87>
    [C]: in function 'DenseCapModel'
    ./models.lua:7: in function 'setup'
    train.lua:48: in main chunk
    [C]: in function 'dofile'
    ...eiMi/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:145: in main chunk
    [C]: at 0x00405840

I can't find how to solve this...

[jcjohnson]

There is some problem with your protobuf which is needed by loadcaffe; I'm not exactly sure how to solve this.

[as641651]

I had this error. I updated protobuf and it was fixed