public static SequenceBuilder GetWTM_TopKFreqCoder(byte bits_per_code, int K, SequenceBuilder seq_builder = null) { return delegate (IList<int> seq, int sigma) { var wt = new WTM(); TopKFreqCoder symcoder; var __coder = new EqualSizeCoder(bits_per_code, sigma - 1); var freqs = new int[sigma]; for (int i = 0; i < seq.Count; ++i) { freqs[seq[i]]++; } symcoder = new TopKFreqCoder(K, freqs, __coder); wt.Build(seq, sigma, symcoder, seq_builder); return wt; }; }
public void Build(IList<int> text, int alphabet_size, ISymbolCoder symbol_split = null, SequenceBuilder seq_builder = null) { if (symbol_split == null) { symbol_split = new EqualSizeCoder(4, alphabet_size-1); } this.SymbolCoder = symbol_split; var list = this.SymbolCoder.Encode(0, null); var numbits = list[0].numbits; var arity = (short)(1 << numbits); this.Alphabet = new WTM_Leaf[alphabet_size]; this.Root = new WTM_Inner (arity, null, true); for (int i = 0; i < text.Count; i++) { this.Add (text [i], list); } if (seq_builder == null) { seq_builder = SequenceBuilders.GetSeqPlain(arity); } this.FinishBuild (this.Root, seq_builder, arity); }
public static SequenceBuilder GetWTM(byte bits_per_code, SequenceBuilder seq_builder = null) { return delegate (IList<int> seq, int sigma) { var wt = new WTM(); var symcoder = new EqualSizeCoder(bits_per_code, sigma - 1); wt.Build(seq, sigma, symcoder, seq_builder); return wt; }; }