krickert commented on code in PR #1106:
URL: https://github.com/apache/opennlp/pull/1106#discussion_r3541323631
##########
opennlp-docs/src/docbkx/namefinder.xml:
##########
@@ -155,13 +155,81 @@ Span[] nameSpans = nameFinder.find(sentence);]]>
<programlisting language="java">
<![CDATA[File model = new File("/path/to/model.onnx");
File vocab = new File("/path/to/vocab.txt");
-Map<Integer, String> categories = new HashMap<>();
-String[] tokens = new String[]{"George", "Washington", "was", "president",
"of", "the", "United", "States", "."};
-NameFinderDL nameFinderDL = new NameFinderDL(model, vocab, false,
getIds2Labels());
-Span[] spans = nameFinderDL.find(tokens);]]>
+// Maps every model output index to its BIO label. This must be exhaustive
over the model's
+// output indices; an unmapped predicted index raises IllegalStateException
during find().
+Map<Integer, String> ids2Labels = new HashMap<>();
+ids2Labels.put(0, "O");
+ids2Labels.put(1, "B-PER");
+ids2Labels.put(2, "I-PER");
+ids2Labels.put(3, "B-ORG");
+ids2Labels.put(4, "I-ORG");
+ids2Labels.put(5, "B-LOC");
+ids2Labels.put(6, "I-LOC");
+ids2Labels.put(7, "B-MISC");
+ids2Labels.put(8, "I-MISC");
+SentenceDetector sentenceDetector =
+ new SentenceDetectorME(new SentenceModel(new
File("/path/to/en-sent.bin")));
+String[] tokens = {"George", "Washington", "was", "president", "of", "the",
"United", "States", "."};
+NameFinderDL nameFinderDL = new NameFinderDL(model, vocab, ids2Labels,
sentenceDetector);
+// findInOriginal returns spans in the original input's coordinates.
+Span[] spans = nameFinderDL.findInOriginal(tokens);]]>
</programlisting>
For additional examples, refer to the
<code>NameFinderDLEval</code> class.
</para>
+ <para>
+ Long input text is split into
overlapping chunks on the full Unicode
+ <code>White_Space</code> set before
WordPiece tokenization, so spacing such as a
+ no-break space or the CJK ideographic
space is recognized as a delimiter. After
+ inference, reconstructed entity text is
matched back to the caller's original input
+ with a Unicode-aware cursor scan (not a
regular expression), so
+ <code>Span#getCoveredText(...)</code>
returns the source text even when WordPiece
+ rejoins sub-tokens with spaces or when
the source uses non-ASCII whitespace between
+ tokens.
+ </para>
+ <para>
+ <code>findInOriginal</code> is declared
by the <code>OffsetMappingNameFinder</code>
+ capability interface that
<code>NameFinderDL</code> implements, so a caller holding a
+ plain <code>TokenNameFinder</code> can
detect the offset-mapping capability with a
+ <code>finder instanceof
OffsetMappingNameFinder</code> check (no reflection) and fall
+ back to token-index spans otherwise.
+ </para>
+ <para>
+ Optional preprocessing of the joined
input text is available through
+ <code>InferenceOptions</code> and is
off by default:
+
<code>setNormalizeWhitespace(true)</code> folds each Unicode whitespace
character to
+ an ASCII space, and
<code>setNormalizeDashes(true)</code> folds Unicode dashes to the
+ ASCII hyphen-minus. Whitespace folding
is one code point to one character and
+ preserves offsets, and so is dash
folding for Basic Multilingual Plane dashes; a
+ supplementary-plane dash shrinks from
two UTF-16 units to one and shifts later
+ offsets, which
<code>findInOriginal</code> maps back across (see
+ <xref linkend="tools.normalizer.dl"/>).
Full details, the underlying
+ <code>CharClass</code> engine, and the
broader normalization pipeline are documented
+ in <xref linkend="tools.normalizer"/>.
+ </para>
+ <programlisting language="java">
Review Comment:
done
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