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+# Torchreid MVB Fork Documentation
+The MVB fork adds additional functionalities for re-ID research, experimentation, and visualization in addition to the Pytorch library Torchreid. It also contains a built-in interface for NUCTECH's Multi-View Baggage (MVB) dataset.
+#### Notice
+The MVB fork is still in active development so bugs and errors should be expected.
+##Installation
+```shell
+$ cd deep-person-reid/
+# yet to be updated...
+$ pip install -r requirements.txt  
+$ python setup.py develop
+```
+
+## MVB Dataset Preparation
+The current setup assumes some root data folder `$DATA` with the structure:
+
+``` shell
+$DATA
+└── MVB_train
+    ├── Image
+    │   ├── 0000_g_1.jpg
+    │   ├── ...
+    └── Info
+        ├── sa_gallery.csv
+        ├── sa_query.csv
+        ├── sa_train.csv
+        └── train.json
+```
+
+where `sa_{gallery,query,train}.csv` contain information about the gallery, query, and train identities in the form of `filename, pid, camid`.
+
+The MVB data loader is located at `torchreid/data/datasets/image/mvb.py`.
+
+## Usage
+We suggest that you use the unified interface located at `scripts/main.py` to train your models. 
+
+We provide some common flags that you'll probably often use here. For a full documentation of the interface, go to `scripts/default_parser.py` for descriptions and default values.
+
+* Dataset root: `--root <path/to/dataset>`
+* Sources (must have an interface): `-s` `--source` (for mvb, use `-s mvb`)
+* Data type: `--app` (default: `image`)
+* Loss: `--loss` (options: `softmax`, `triplet`) Note: combination of softmax and tirplet loss can be achieved by setting `--weight-t <triplet_weight>` and `--weight-x <softmax_weight>`. If you use triplet loss, `--train-sampler` must be set to `RandomIdentitySampler`
+* Input dimension: `--height` and `--width`
+* Label smoothing: `--label-smooth` (using label smoothing regularizer in cross entropy loss increases performance empirically)
+* Model architecture: `-a` `--arch`. Full list see `torchreid/models/__init__.py`
+* Optimizer config: `--optim <optimizer>` `--lr <learning_rate>` (suggest `adam` and `0.00065`)
+* Lr scheduler: `--lr-scheduler <scheduler>` (default: `auto` which is ReduceLROnPlateau). `--patience`, `--gamma` (reduction factor), and `--min-lr` can be set. 
+* Preprocessing: `--transforms random_crop random_flip random_erase`
+* Training: `--max-epoch` `--fixbase-epoch` (used when finetuning) `--open-layers` (layer names to open while fixbase) `--load-weights` (pretrained weights) `--batch-size`  `--save-dir` (logging dir, where checkpoints, logs, visualizations, and tfboard events stay) `--use-avai-gpus`
+* Resume: `--resume <path/to/checkpoint>`. Setting new `--lr` or lr_scheduler config flags will overwrite the checkpoint config. 
+* Evaluation: `--start-eval` `--eval-freq` ` --ranks` (ranks you want to calculate)
+* Visualization: `--viscam` `--viscam-num <k>` visualize the class activation map of k images in probe and gallery (respectively) after GAP (which layer can be changed in `torchreid/utils/cam.py`) CAMs stored in `$LOGDIR/viscam-<epoch>/`. `--visrank` `--visrank-topk` visualize the top k retrieved identities of each probe. Images stored in `$LOGDIR/visrank-<epoch>/`.
+* Separate test/evaluation: add `--evaluate` and `--load-weights`. If only want to visualize CAM add `--viscam-only` (will raise `RuntimeError` after CAMs are saved)
+* Rerank: `--rerank`
+* Comet.ml: If you do not have your comet API key set up or do not want to log to comet, use `--no-comet` 
+* Combine: `--combine-method`. Use combine method of `{none, mean}`. (`mean` means embeddings of different images of the same id will be averaged in retrieval to represent that identity).
+
+A sample training script is as below:
+
+```shell
+python scripts/main.py --root ../../data --app image --loss softmax --label-smooth -s mvb -a osnet_custom --height 256 --width 256 --optim adam --lr 0.00065 --gamma 0.5 --max-epoch 180 --fixbase-epoch 5 --open-layers fc classifier --batch-size 50 --transforms random_crop random_flip random_erase --load-weights ~/.cache/torch/checkpoints/osnet_x1_0_imagenet.pth --save-dir log/osnet_custom-softmax-2048featdim --use-avai-gpus --start-eval 15 --eval-freq 5 --ranks 1 2 3 5 10 20
+```
+
+A sample testing script is as below:
+
+```shell
+python scripts/main.py --root ../../data --app image --loss softmax --label-smooth -s mvb -a osnet_x1_0 --height 256 --width 256 --batch-size 36 --load-weights log/osnet_x1_0-softmax/model.pth.tar-70 --evaluate --save-dir log/osnet_x1_0-softmax --use-avai-gpus --no-comet --rerank --viscam --viscam-num 20
+```
+
+###Logging
+* Plain text log files (stdout) are stored in `$LOGDIR`.
+* Tensorboard events are written to `scripts/runs/<stem($LOGDIR)>`.
+* Metrics, hyperparameters, system metrics, stdout, cli flags, etc. are logged to Comet.ml unless `--no-comet` is set. Comet.ml config can be changed in `scripts/main.py`.
+
+## Fork Contributor
+Tianyu (John) Zhang @ NUCTECH, Bo (Hiroshi) Wu, Yicong (Michael) Mao
+
+
+