[−][src]Struct lipsum::MarkovChain
Simple order two Markov chain implementation.
The Markov chain is a chain of order two, which means that it will use the previous two words (a bigram) when predicting the next word. This is normally enough to generate random text that looks somewhat plausible. The implementation is based on Generating arbitrary text with Markov chains in Rust.
Implementations
impl<'a> MarkovChain<'a, ThreadRng>
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pub fn new() -> MarkovChain<'a, ThreadRng>
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Create a new empty Markov chain. It will use a default thread-local random number generator.
Examples
use lipsum::MarkovChain; let chain = MarkovChain::new(); assert!(chain.is_empty());
impl<'a, R: Rng> MarkovChain<'a, R>
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pub fn new_with_rng(rng: R) -> MarkovChain<'a, R>
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Create a new empty Markov chain that uses the given random number generator.
Examples
use rand::SeedableRng; use rand_chacha::ChaCha20Rng; use lipsum::MarkovChain; let rng = ChaCha20Rng::seed_from_u64(0); let mut chain = MarkovChain::new_with_rng(rng); chain.learn("infra-red red orange yellow green blue indigo x-ray"); // The chain jumps consistently like this: assert_eq!(chain.generate(1), "Orange."); assert_eq!(chain.generate(1), "Infra-red."); assert_eq!(chain.generate(1), "Yellow.");
pub fn learn(&mut self, sentence: &'a str)
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Add new text to the Markov chain. This can be called several times to build up the chain.
Examples
use lipsum::MarkovChain; let mut chain = MarkovChain::new(); chain.learn("red green blue"); assert_eq!(chain.words(("red", "green")), Some(&vec!["blue"])); chain.learn("red green yellow"); assert_eq!(chain.words(("red", "green")), Some(&vec!["blue", "yellow"]));
pub fn len(&self) -> usize
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Returs the number of states in the Markov chain.
Examples
use lipsum::MarkovChain; let mut chain = MarkovChain::new(); assert_eq!(chain.len(), 0); chain.learn("red orange yellow green blue indigo"); assert_eq!(chain.len(), 4);
pub fn is_empty(&self) -> bool
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Returns true
if the Markov chain has no states.
Examples
use lipsum::MarkovChain; let mut chain = MarkovChain::new(); assert!(chain.is_empty()); chain.learn("foo bar baz"); assert!(!chain.is_empty());
pub fn words(&self, state: Bigram<'a>) -> Option<&Vec<&str>>
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Get the possible words following the given bigram, or None
if the state is invalid.
Examples
use lipsum::MarkovChain; let mut chain = MarkovChain::new(); chain.learn("red green blue"); assert_eq!(chain.words(("red", "green")), Some(&vec!["blue"])); assert_eq!(chain.words(("foo", "bar")), None);
pub fn generate(&mut self, n: usize) -> String
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Generate a sentence with n
words of lorem ipsum text. The
sentence will start from a random point in the Markov chain
and a .
will be added as necessary to form a full sentence.
See generate_from
if you want to control the starting
point for the generated text and see iter
if you simply
want a sequence of words.
Examples
Generating the sounds of a grandfather clock:
use lipsum::MarkovChain; let mut chain = MarkovChain::new(); chain.learn("Tick, Tock, Tick, Tock, Ding! Tick, Tock, Ding! Ding!"); println!("{}", chain.generate(15));
The output looks like this:
Ding! Tick, Tock, Tick, Tock, Ding! Ding! Tock, Ding! Tick, Tock, Tick, Tock, Tick, Tock.
pub fn generate_from(&mut self, n: usize, from: Bigram<'a>) -> String
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Generate a sentence with n
words of lorem ipsum text. The
sentence will start from the given bigram and a .
will be
added as necessary to form a full sentence.
Use generate
if the starting point is not important. See
iter_from
if you want a sequence of words that you can
format yourself.
pub fn iter(&mut self) -> Words<R>
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Make a never-ending iterator over the words in the Markov chain. The iterator starts at a random point in the chain.
pub fn iter_from(&mut self, from: Bigram<'a>) -> Words<R>
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Make a never-ending iterator over the words in the Markov chain. The iterator starts at the given bigram.
Trait Implementations
impl<'a> Default for MarkovChain<'a, ThreadRng>
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Auto Trait Implementations
impl<'a, R> RefUnwindSafe for MarkovChain<'a, R> where
R: RefUnwindSafe,
R: RefUnwindSafe,
impl<'a, R> Send for MarkovChain<'a, R> where
R: Send,
R: Send,
impl<'a, R> Sync for MarkovChain<'a, R> where
R: Sync,
R: Sync,
impl<'a, R> Unpin for MarkovChain<'a, R> where
R: Unpin,
R: Unpin,
impl<'a, R> UnwindSafe for MarkovChain<'a, R> where
R: UnwindSafe,
R: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,