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;
};
}
