Scalar field

[EiffL]

This pull request introduces a new ScalarFieldCodec for handling scalar field modalities, including its implementation, integration into the existing framework, and associated tests. The changes focus on adding support for scalar fields as a new modality and ensuring compatibility with the current codec and modality structure.

Codec and Modality Enhancements:

• Added a new ScalarFieldCodec class in aion/codecs/scalar_field.py, which includes an autoencoder-based architecture for encoding and decoding scalar fields. It supports features such as quantization, loss optimization, and exponential moving average (EMA) of model weights.
• Introduced a new ScalarField modality in aion/modalities.py to represent 2D scalar fields like density or temperature maps. Updated the ModalityType union to include ScalarField. [1] [2]

Codebase Integration:

• Registered the ScalarFieldCodec in aion/codecs/__init__.py to make it accessible within the codec package. [1] [2]
• Added the ModelEmaV2 class in aion/codecs/modules/ema.py to support exponential moving average for model weights, which is used in the new codec.

Testing and Validation:

• Added test data files for scalar field codec input, encoded, and decoded batches in tests/test_data for validating codec functionality. [1] [2] [3]
• Implemented a new test case in tests/tokenizers/test_scalar_field_tokenizer.py to verify the encoding and decoding processes of the ScalarFieldCodec against reference data.

[Copilot]

Pull Request Overview

This PR introduces a new ScalarField modality and its corresponding autoencoder-based codec, ScalarFieldCodec, to extend the framework’s support for 2D scalar field data. Key changes include:

• Implementation of ScalarFieldCodec (with quantization and EMA support) in aion/codecs/scalar_field.py.
• Integration of the new ScalarField modality in aion/modalities.py and registration of the codec in aion/codecs/init.py.
• Addition of test cases and data for verifying codec functionality.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/tokenizers/test_scalar_field_tokenizer.py	Adds tests for encoding/decoding scalar field data.
tests/test_data/*.pt	Provides test data for input, encoded, and decoded scalar field batches.
aion/modalities.py	Introduces new ScalarField modality and updates ModalityType union.
aion/codecs/scalar_field.py	Implements the ScalarFieldCodec with autoencoder, quantization, and EMA support.
aion/codecs/modules/ema.py	Adds ModelEmaV2 implementation for model weight averaging.
aion/codecs/init.py	Registers ScalarFieldCodec in the codecs package.

Comments suppressed due to low confidence (1)

aion/codecs/scalar_field.py:96

• [nitpick] There's an inconsistent spelling between 'quantisation_loss_weight' in the parameter and 'quantization_loss_weight' in the assignment. Please choose one consistent spelling for clarity.

self.quantization_loss_weight = quantisation_loss_weight