Adds mixing loader for FSL datasets

CHANGELOG.md

@@ -9,6 +9,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Added `SourceMixtureDataset` for composing a training mixture based on ratios of source datasets.
+- Added `NumpyFSLDatasetMixture` for constructing a `NumpyDatasetBase` from a `SourceMixtureDataset`. Note this is only supported for FSL datasets.
+- Added tests for `SourceMixture*` and `NumpyFSLDatasetMixture`.
+
+### Changed
+- Moved some types into `olmo_core.data.types` to avoid some circular dependencies.
 - Added `DownstreamEvaluatorCallbackConfig` class for running in-loop downstream eval via [OLMo-in-loop-evals](https://github.com/allenai/OLMo-in-loop-evals).
 
 ### Removed

pyproject.toml

@@ -37,6 +37,7 @@ dev = [
     "black>=23.1,<24.0",
     "isort>=5.12,<5.13",
     "pytest",
+    "pytest-memray",
     "pytest-sphinx",
     "pytest-xdist",
     "twine>=1.11.0",

src/olmo_core/data/__init__.py

@@ -24,8 +24,6 @@
 from .numpy_dataset import (
     NumpyDatasetBase,
     NumpyDatasetConfig,
-    NumpyDatasetDType,
-    NumpyDatasetType,
     NumpyFSLDataset,
     NumpyPaddedFSLDataset,
     NumpyVSLDataset,
@@ -38,6 +36,7 @@
     VSLNaturalCurriculum,
 )
 from .tokenizer import TokenizerConfig, TokenizerName
+from .types import NumpyDatasetDType, NumpyDatasetType
 
 __all__ = [
     "NumpyDatasetBase",