# action-recognition-0001 (composite)¶

## Use Case and High-Level Description¶

This is a general-purpose action recognition composite model, consisting of encoder and decoder parts, trained on Kinetics-400 dataset. The encoder model uses Video Transformer approach with ResNet34 encoder. Please refer to the kinetics dataset specification to see list of action that are recognised by this composite model.

Metric

Value

Source framework

PyTorch*

## Encoder model specification¶

The action-recognition-0001-encoder model accepts video frame and produces embedding. Video frames should be sampled to cover ~1 second fragment (i.e. skip every second frame in 30 fps video).

Metric

Value

GFlops

7.340

MParams

21.276

### Inputs¶

Image, name: 0, shape: 1, 3, 224, 224 in the format B, C, H, W, where:

• B - batch size

• C - number of channels

• H - image height

• W - image width

Expected color order is BGR.

### Outputs¶

The model outputs a tensor with the shape 1, 512, 1, 1, representing embedding of processed frame.

## Decoder model specification¶

The action-recognition-0001-decoder model accepts stack of frame embeddings, computed by action-recognition-0001-encoder model.

Metric

Value

GFlops

0.147

MParams

4.405

### Inputs¶

An embedding image, name: 0, shape: 1, 16, 512 in the format B, T, C, where:

• B - batch size

• T - duration of input clip

• C - dimension of embedding

### Outputs¶

The model outputs a tensor with the shape 1, 400, each row is a logits vector of performed actions.

## Demo usage¶

The model can be used in the following demos provided by the Open Model Zoo to show its capabilities: