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license: apache-2.0
tags:
- motion-inbetweening
- keypose-extraction
- character-animation
- adaptive-interpolation-synthesis
---
## Model Description
This is the AIS-BiLSTM model accompanying the paper:
https://arxiv.org/abs/2605.02742
> Raël et al., "Adaptive Interpolation-Synthesis for Motion In-Betweening on Keyframe-Based Animation",
> SIGGRAPH 2026 Conference Papers (2026)
The AIS-BiLSTM model takes as input a tensor of shape N×(D+1), where N is the number of frames in the sequence and D=596 is the pose dimension. The K input keyposes are placed at their target frame indices in the first D channels, with all other frames zero-filled. The last channel is a binary mask flagging the K keypose positions. The model predicts the full N×D pose sequence.
## Model Details
| Property | Value |
| ------------------------ | ------------------------------------------------------------ |
| Framework | PyTorch Lightning |
| Checkpoint format | `.safetensors` |
| Input | Masked sequence of shape N×(D+1) |
| Output | Completed sequence of shape N×D |
| Pose dimensionality | D = 596 |
| Training sequence length | N=224 frames (fixed); variable length supported at inference |
| Frame rate | 24 fps |
## Usage
See the [GitHub repository](https://github.com/animaj-lab/mib-ais)
## Training Data
Trained on the `train` split of the [mib_rig_controllers_values](https://huggingface.co/datasets/AnimajSAS/mib_rig_controllers_values) dataset, comprising ~8.1 hours of professionally handcrafted animation at 24 fps.
## Test Data
Evaluated on three test splits of the [mib_rig_controllers_values](https://huggingface.co/datasets/AnimajSAS/mib_rig_controllers_values) dataset:
| Split | Schedule | Description |
| --------------------------- | -------------- | ---------------------------------------------------------------------------------- |
| `test_held_out_algorithmic` | DBA | Held-Out set with a deterministic keypose schedule from the domain-based algorithm |
| `test_held_out_random` | Random (r=0.9) | Held-Out set with a random keypose schedule |
| `test_production` | Block | 5 min production data with ground-truth block keyposes |
## License
Apache 2.0
|