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# Stateful Classes
Below are variations of a [singleton class](https://en.wikipedia.org/wiki/Singleton_pattern) in the sense that all
instances share the same state, which is initialized on the first instantiation.
These classes are immutable and store information about certain configurations or
states.
## PartialState
[[autodoc]] state.PartialState
## AcceleratorState
[[autodoc]] state.AcceleratorState
## GradientState
[[autodoc]] state.GradientState
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