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EPIC-KITCHENS-55 action recognition models

This is a set of models trained for EPIC-KITCHENS-55 baselines. We support:

• TSN
• TRN
• TSM

Many thanks to the authors of these repositories.

You can use the code provided here in one of two ways:

1. PyTorch hub (recommended)
2. Local installation

PyTorch Hub

PyTorch Hub is a way to easily share models with others. Using our models via hub is as simple as

import torch.hub
repo = 'epic-kitchens/action-models'

class_counts = (125, 352)
segment_count = 8
base_model = 'resnet50'
tsn = torch.hub.load(repo, 'TSN', class_counts, segment_count, 'RGB',
                     base_model=base_model, 
                     pretrained='epic-kitchens', force_reload=True)
trn = torch.hub.load(repo, 'TRN', class_counts, segment_count, 'RGB',
                     base_model=base_model, 
                     pretrained='epic-kitchens')
mtrn = torch.hub.load(repo, 'MTRN', class_counts, segment_count, 'RGB',
                     base_model=base_model, 
                      pretrained='epic-kitchens')
tsm = torch.hub.load(repo, 'TSM', class_counts, segment_count, 'RGB',
                     base_model=base_model, 
                     pretrained='epic-kitchens')

# Show all entrypoints and their help strings
for entrypoint in torch.hub.list(repo):
    print(entrypoint)
    print(torch.hub.help(repo, entrypoint))

batch_size = 1
segment_count = 8
snippet_length = 1  # Number of frames composing the snippet, 1 for RGB, 5 for optical flow
snippet_channels = 3  # Number of channels in a frame, 3 for RGB, 2 for optical flow
height, width = 224, 224

inputs = torch.randn(
    [batch_size, segment_count, snippet_length, snippet_channels, height, width]
)
# The segment and snippet length and channel dimensions are collapsed into the channel
# dimension
# Input shape: N x TC x H x W
inputs = inputs.reshape((batch_size, -1, height, width))
for model in [tsn, trn, mtrn, tsm]:
    # You can get features out of the models
    features = model.features(inputs)
    # and then classify those features
    verb_logits, noun_logits = model.logits(features)
    
    # or just call the object to classify inputs in a single forward pass
    verb_logits, noun_logits = model(inputs)
    print(verb_logits.shape, noun_logits.shape)

NOTE: We are dependent upon a fork of Remi Cadene's pretrained models that brings DataParallel support to PyTorch 1+. Install this with:

$ pip install git+https://github.com/wpwei/pretrained-models.pytorch.git@vision_bug_fix

Local Installation

Models are available to downloaded from data.bris.ac.uk.

We provide an environment.yml file to create a conda environment. Sadly not all of the set up can be encapsulated in this file, so you have to perform some steps yourself (in the interest of eeking extra performance!)

$ conda env create -n epic-models -f environment.yml
$ conda activate epic-models

# The following steps are taken from
# https://docs.fast.ai/performance.html#installation

$ conda uninstall -y --force pillow pil jpeg libtiff
$ pip uninstall -y pillow pil jpeg libtiff
$ conda install -y -c conda-forge libjpeg-turbo
$ CFLAGS="${CFLAGS} -mavx2" pip install --upgrade --no-cache-dir --force-reinstall --no-binary :all: --compile pillow-simd
$ conda install -y jpeg libtiff

NOTE: If the installation of pillow-simd fails, you can try installing GCC from conda-forge and trying the install again:

$ conda install -y gxx_linux-64
$ export CXX=x86_64-conda_cos6-linux-gnu-g++
$ export CC=x86_64-conda_cos6-linux-gnu-gcc
$ CFLAGS="${CFLAGS} -mavx2" pip install --upgrade --no-cache-dir --force-reinstall --no-binary :all: --compile pillow-simd
$ conda install -y jpeg libtiff

If you install any new packages, check that pillow-simd hasn't be overwritten by an alternate pillow install by running:

$ python -c "from PIL import Image; print(Image.PILLOW_VERSION)"

You should see something like

6.0.0.post1

Pillow doesn't release with post suffixes, so if you have post in the version name, it's likely you have pillow-simd installed.

How to use the code

Check out demo.py for an example of how to construct the models and feed in data, or read on below for how to load checkpointed models.

Checkpoints

Checkpoints are saved as dictionaries with the following information:

• model_type (str): Variant. Either 'tsm', 'tsm-nl', 'tsn', 'trn', or 'mtrn'
• epoch (int): Last epoch completed in training
• segment_count (int): Number of segments the network was trained with.
• modality (str): Modality of the input. Either 'RGB' or 'Flow'
• state_dict (dict): State dictionary of the network for use with model.load_state_dict
• arch (str): Modality of network. Either 'BNInception' or 'resnet50'.
• args (namespace): All the arguments used in training the network.

Some keys are only present depending on model type:

• TSN:
  • consensus_type (str, TSN only): Consensus module variant for TSN. Either 'avg' or 'max'.
• TSM:
  • shift_place (str, TSM only): Identifier for where the shift module is located. Either block or blockres.
  • shift_div (int, TSM only): The reciprocal of the proportion of channels used that are shifted.
  • temporal_pool (bool, TSM only): Whether gradual temporal pooling was used in this network.
  • non_local (bool, TSM only): Whether non-local blocks were added to this network.

To load checkpointed weights, first construct an instance of the network (using information stored in the checkpoint about the architecture set up), then call model.load_state_dict. For example:

from tsn import TSN
import torch

verb_class_count, noun_class_count = 125, 352
class_count = (verb_class_count, noun_class_count)
ckpt = torch.load('TSN_modality=RGB_segments=8_arch=resnet50.pth')
model = TSN(
    num_class=class_count,
    num_segments=ckpt['segment_count'],
    modality=ckpt['modality'],
    base_model=ckpt['arch'],
    dropout=ckpt['args'].dropout
)
model.load_state_dict(ckpt['state_dict'])

We provide some helpers functions for this purpose in model_loaders.py so you can simply load checkpoints like:

from model_loader import load_checkpoint
model = load_checkpoint('path/to/checkpoint.pth.tar')

Data Loading

We make use of the transforms available in the original TSN codebase. Providing you load your frames as a list of PIL.Image you can reuse the same data loading code as we use below. Note that you will have to populate the net and backbone_arch variables with the instantiation of the network and a string describing the name of the backbone architecture (e.g. 'resnet50' or 'BNInception').

from torchvision.transforms import Compose
from transforms import GroupScale, GroupCenterCrop, GroupOverSample, Stack, ToTorchFormatTensor, GroupNormalize

crop_count = 10
net = ...
backbone_arch = ...

if crop_count == 1:
    cropping = Compose([
        GroupScale(net.scale_size),
        GroupCenterCrop(net.input_size),
    ])
elif crop_count == 10:
    cropping = GroupOverSample(net.input_size, net.scale_size)
else:
    raise ValueError("Only 1 and 10 crop_count are supported while we got {}".format(crop_count))

transform = Compose([
    cropping,
    Stack(roll=backbone_arch == 'BNInception'),
    ToTorchFormatTensor(div=backbone_arch != 'BNInception'),
    GroupNormalize(net.input_mean, net.input_std),
])

Checkpoints

The checkpoints accompanying this repository score the following on the test set when using 10 crop evaluation.

Extracting features

Classes include features and logits methods, mimicking the pretrainedmodels API. Simply create a model instance model = TSN(...) and call model.features(input) to obtain base-model features. To transform these to logits, call model.logits(features) where features is the tensor obtained from the previous step.

Utilities

You can have a look inside the checkpoints using python tools/print_checkpoint_details.py <path-to-checkpoint> to print checkpoint details including the model variant, number of segments, modality, architecture, and weight shapes.

Citation

If you find our code and trained models helpful, please kindly cite our work and dataset in addition to the authors of the models themselves (citation information for this is in the following section).

@article{price2019_EvaluationActionRecognition,
    title={An Evaluation of Action Recognition Models on EPIC-Kitchens},
    author={Price, Will and Damen, Dima},
    journal={arXiv preprint arXiv:1908.00867},
    archivePrefix={arXiv},
    eprint={1908.00867},
    year={2019},
    month="Aug"
}

@inproceedings{damen2018_ScalingEgocentricVision,
   title={Scaling Egocentric Vision: The EPIC-KITCHENS Dataset},
   author={Damen, Dima and Doughty, Hazel and Farinella, Giovanni Maria  and Fidler, Sanja and
           Furnari, Antonino and Kazakos, Evangelos and Moltisanti, Davide and Munro, Jonathan
           and Perrett, Toby and Price, Will and Wray, Michael},
   booktitle={European Conference on Computer Vision (ECCV)},
   year={2018}
}

Acknowledgements

We'd like to thank the academics and authors responsible for the following codebases that enabled this work.

• TSN
• TRN
• TSM
• pretrained-models.pytorch

If you make use of this repository, please cite their work as well as ours

TSN:

@InProceedings{wang2016_TemporalSegmentNetworks,
    title={Temporal Segment Networks: Towards Good Practices for Deep Action Recognition},
    author={Limin Wang and Yuanjun Xiong and Zhe Wang and Yu Qiao and Dahua Lin and
            Xiaoou Tang and Luc {Val Gool}},
    booktitle={The European Conference on Computer Vision (ECCV)},
    year={2016}
}

TRN:

@InProceedings{zhou2017_TemporalRelationalReasoning,
    title={Temporal Relational Reasoning in Videos},
    author={Zhou, Bolei and Andonian, Alex and Oliva, Aude and Torralba, Antonio},
    booktitle={The European Conference on Computer Vision (ECCV)},
    month={September},
    year={2018}
}

TSM:

@article{lin2018_TemporalShiftModule,
    title={Temporal Shift Module for Efficient Video Understanding},
    author={Lin, Ji and Gan, Chuang and Han, Song},
    journal={arXiv preprint arXiv:1811.08383},
    archivePrefix={arXiv},
    eprint={1811.08383},
    year={2018},
    month="Nov"
}