Struct PpmModel

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pub struct PpmModel { /* private fields */ }

Expand description

PPM model with checksum-validated hash tables at orders 0-12.

Memory budget depends on config:

Default: ~90MB total
Scaled 4x: ~360MB total
Order 0: 1 entry (global unigram)
Order 1: 256 entries
Order 2: 64K entries
Orders 3+: configurable

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impl PpmModel

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pub fn new() -> Self

Create a new PPM model with default sizes (~90MB).

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pub fn with_config(config: PpmConfig) -> Self

Create a PPM model with the given configuration.

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pub fn predict_bit(&mut self, bpos: u8, c0: u32) -> u32

Predict bit probability. Returns 12-bit probability [1, 4095].

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pub fn update_byte(&mut self, byte: u8)

Update PPM model after a full byte has been decoded.

Trait Implementations§

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impl Default for PpmModel

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fn default() -> Self

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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impl UnwindSafe for PpmModel

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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