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DRAGON: From Generalized zero-shot learning to long-tail with class descriptors

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Overview

DRAGON learns to correct the bias towards head classes on a sample-by-sample basis; and fuse information from class-descriptions to improve the tail-class accuracy, as described in our paper: Samuel, Atzmon and Chechik, "From Generalized zero-shot learning to long-tail with class descriptors".

Requirements

• numpy 1.15.4
• pandas 0.25.3
• scipy 1.1.0
• tensorflow 1.14.0
• keras 2.2.5

Quick installation under Anaconda:

conda env create -f requirements.yml

Data Preparation

Datasets: CUB, SUN and AWA.
Download data.tar from here, untar it and place it under the project root directory.

DRAGON
| data
   |--CUB
   |--SUN
   |--AWA1
| attribute_expert
| dataset_handler
| fusion
...

Train Experts and Fusion Module

Reproduce results for DRAGON and its modules (Table 1 in our paper):
Training and evaluation should be according to the training protocol described in our paper (Section 5 - training):

1. First, train each expert without the hold-out set (partial training set) by executing the following commands:

   • CUB:

     # Visual-Expert training
     PYTHONPATH="./" python visual_expert/main.py --base_train_dir=./checkpoints/CUB --dataset_name=CUB --transfer_task=DRAGON --train_dist=dragon --data_dir=data --batch_size=64 --max_epochs=100 --initial_learning_rate=0.0003 --l2=0.005
     # Attribute-Expert training 
     PYTHONPATH="./" python attribute_expert/main.py --base_train_dir=./checkpoints/CUB --dataset_name=CUB --transfer_task=DRAGON --data_dir=data --train_dist=dragon --batch_size=64 --max_epochs=100 --initial_learning_rate=0.001 --LG_beta=1e-7 --LG_lambda=0.0001 --SG_gain=3 --SG_psi=0.01 --SG_num_K=-1
     

   • SUN:

     # Visual-Expert training
     PYTHONPATH="./" python visual_expert/main.py --base_train_dir=./checkpoints/SUN --dataset_name=SUN --transfer_task=DRAGON --train_dist=dragon --data_dir=data --batch_size=64 --max_epochs=100 --initial_learning_rate=0.0001 --l2=0.01
     # Attribute-Expert training 
     PYTHONPATH="./" python attribute_expert/main.py --base_train_dir=./checkpoints/SUN --dataset_name=SUN --transfer_task=DRAGON --data_dir=data --train_dist=dragon --batch_size=64 --max_epochs=100 --initial_learning_rate=0.001 --LG_beta=1e-6 --LG_lambda=0.001 --SG_gain=10 --SG_psi=0.01 --SG_num_K=-1
     

   • AWA:

     # Visual-Expert training
     PYTHONPATH="./" python visual_expert/main.py --base_train_dir=./checkpoints/AWA1 --dataset_name=AWA1 --transfer_task=DRAGON --train_dist=dragon --data_dir=data --batch_size=64 --max_epochs=100 --initial_learning_rate=0.0003 --l2=0.1
     # Attribute-Expert training 
     PYTHONPATH="./" python attribute_expert/main.py --base_train_dir=./checkpoints/AWA1 --dataset_name=AWA1 --transfer_task=DRAGON --data_dir=data --train_dist=dragon --batch_size=64 --max_epochs=100 --initial_learning_rate=0.001 --LG_beta=0.001 --LG_lambda=0.001 --SG_gain=1 --SG_psi=0.01 --SG_num_K=-1
     

2. Then, re-train each expert, with the hold-out set (full train set) by executing above commands with the --test_mode flag as a parameter.

3. Rename Visual-lr=0.0003_l2=0.005 to Visual and LAGO-lr=0.001_beta=1e-07_lambda=0.0001_gain=3.0_psi=0.01 to LAGO (this is essential since the FusionModule finds trained experts by their names, without extensions).

4. Train the fusion-module on partially trained experts (models from step 1) by running the following commands:

   • CUB:

     PYTHONPATH="./" python fusion/main.py --base_train_dir=./checkpoints/CUB --dataset_name=CUB --data_dir=data --initial_learning_rate=0.005 --batch_size=64 --max_epochs=50 --sort_preds=1 --freeze_experts=1 --nparams=2
     

   • SUN:

     PYTHONPATH="./" python fusion/main.py --base_train_dir=./checkpoints/SUN --dataset_name=SUN --data_dir=data --initial_learning_rate=0.0005 --batch_size=64 --max_epochs=50 --sort_preds=1 --freeze_experts=1 --nparams=4
     

   • AWA:

     PYTHONPATH="./" python fusion/main.py --base_train_dir=./checkpoints/AWA1 --dataset_name=AWA1 --data_dir=data --initial_learning_rate=0.005 --batch_size=64 --max_epochs=50 --sort_preds=1 --freeze_experts=1 --nparams=4
     

5. Finally, evaluate the fusion-module with fully-trained experts (models from step 2), by executing step 4 commands with the --test_mode flag as a parameter.

Pre-trained Models and Checkpoints

Download checkpoints.tar from here, untar it and place it under the project root directory.

checkpoints
  |--CUB
      |--Visual
      |--LAGO
      |--Dual2ParametricRescale-lr=0.005_freeze=1_sort=1_topk=-1_f=2_s=(2, 2)
  |--SUN
      |--Visual
      |--LAGO
      |--Dual4ParametricRescale-lr=0.0005_freeze=1_sort=1_topk=-1_f=2_s=(2, 2)
  |--AWA1
      |--Visual
      |--LAGO
      |--Dual4ParametricRescale-lr=0.005_freeze=1_sort=1_topk=-1_f=2_s=(2, 2)

Cite Our Paper

If you find our paper and repo useful, please cite:

@InProceedings{samuel2020longtail,
  author    = {Samuel, Dvir and Atzmon, Yuval and Chechik, Gal},
  title     = {From Generalized Zero-Shot Learning to Long-Tail With Class Descriptors},
  booktitle = {Proceedings of the IEEE/CVF Winter Conference on Applications of Computer Vision (WACV)},
  year      = {2021}}