/// <summary>
/// Add an element to the tree respecting a size limit
/// </summary>
/// <param name="results"> the tree to add in </param>
/// <param name="result"> the result we try to add </param>
/// <param name="num"> size limit </param>
private static void BoundedTreeAdd(SortedSet <Lookup.LookupResult> results, Lookup.LookupResult result, int num)
{
if (results.Count >= num)
{
if (results.Min.value < result.value)
{
lock (syncLock)
{
if (results.Min.value < result.value)
{
// Code similar to the java TreeMap class
var entry = results.FirstOrDefault();
if (entry != null)
{
results.Remove(entry);
}
}
else
{
return;
}
}
}
else
{
return;
}
}
results.Add(result);
}
/// <summary>
/// Add an element to the tree respecting a size limit
/// </summary>
/// <param name="results"> the tree to add in </param>
/// <param name="result"> the result we try to add </param>
/// <param name="num"> size limit </param>
private static void BoundedTreeAdd(SortedSet <Lookup.LookupResult> results, Lookup.LookupResult result, int num)
{
if (results.Count >= num)
{
if (results.Min.value < result.value)
{
results.PollFirst();
}
else
{
return;
}
}
results.Add(result);
}
public void TestRandom()
{
string[] terms = new string[TestUtil.NextInt32(Random, 2, 10)];
ISet <string> seen = new HashSet <string>();
while (seen.size() < terms.Length)
{
string token = TestUtil.RandomSimpleString(Random, 1, 5);
if (!seen.contains(token))
{
terms[seen.size()] = token;
seen.add(token);
}
}
Analyzer a = new MockAnalyzer(Random);
int numDocs = AtLeast(10);
long totTokens = 0;
string[][] docs = new string[numDocs][];
for (int i = 0; i < numDocs; i++)
{
docs[i] = new string[AtLeast(100)];
if (VERBOSE)
{
Console.Write(" doc " + i + ":");
}
for (int j = 0; j < docs[i].Length; j++)
{
docs[i][j] = GetZipfToken(terms);
if (VERBOSE)
{
Console.Write(" " + docs[i][j]);
}
}
if (VERBOSE)
{
Console.WriteLine();
}
totTokens += docs[i].Length;
}
int grams = TestUtil.NextInt32(Random, 1, 4);
if (VERBOSE)
{
Console.WriteLine("TEST: " + terms.Length + " terms; " + numDocs + " docs; " + grams + " grams");
}
// Build suggester model:
FreeTextSuggester sug = new FreeTextSuggester(a, a, grams, (byte)0x20);
sug.Build(new TestRandomInputIterator(this, docs));
// Build inefficient but hopefully correct model:
List <IDictionary <string, int?> > gramCounts = new List <IDictionary <string, int?> >(grams);
for (int gram = 0; gram < grams; gram++)
{
if (VERBOSE)
{
Console.WriteLine("TEST: build model for gram=" + gram);
}
IDictionary <string, int?> model = new HashMap <string, int?>();
gramCounts.Add(model);
foreach (string[] doc in docs)
{
for (int i = 0; i < doc.Length - gram; i++)
{
StringBuilder b = new StringBuilder();
for (int j = i; j <= i + gram; j++)
{
if (j > i)
{
b.append(' ');
}
b.append(doc[j]);
}
string token = b.toString();
int? curCount = model.ContainsKey(token) ? model[token] : null;
if (curCount == null)
{
model.Put(token, 1);
}
else
{
model.Put(token, 1 + curCount);
}
if (VERBOSE)
{
Console.WriteLine(" add '" + token + "' -> count=" + (model.ContainsKey(token) ? model[token].ToString() : ""));
}
}
}
}
int lookups = AtLeast(100);
for (int iter = 0; iter < lookups; iter++)
{
string[] tokens = new string[TestUtil.NextInt32(Random, 1, 5)];
for (int i = 0; i < tokens.Length; i++)
{
tokens[i] = GetZipfToken(terms);
}
// Maybe trim last token; be sure not to create the
// empty string:
int trimStart;
if (tokens.Length == 1)
{
trimStart = 1;
}
else
{
trimStart = 0;
}
int trimAt = TestUtil.NextInt32(Random, trimStart, tokens[tokens.Length - 1].Length);
tokens[tokens.Length - 1] = tokens[tokens.Length - 1].Substring(0, trimAt - 0);
int num = TestUtil.NextInt32(Random, 1, 100);
StringBuilder b = new StringBuilder();
foreach (string token in tokens)
{
b.append(' ');
b.append(token);
}
string query = b.toString();
query = query.Substring(1);
if (VERBOSE)
{
Console.WriteLine("\nTEST: iter=" + iter + " query='" + query + "' num=" + num);
}
// Expected:
List <Lookup.LookupResult> expected = new List <Lookup.LookupResult>();
double backoff = 1.0;
seen = new HashSet <string>();
if (VERBOSE)
{
Console.WriteLine(" compute expected");
}
for (int i = grams - 1; i >= 0; i--)
{
if (VERBOSE)
{
Console.WriteLine(" grams=" + i);
}
if (tokens.Length < i + 1)
{
// Don't have enough tokens to use this model
if (VERBOSE)
{
Console.WriteLine(" skip");
}
continue;
}
if (i == 0 && tokens[tokens.Length - 1].Length == 0)
{
// Never suggest unigrams from empty string:
if (VERBOSE)
{
Console.WriteLine(" skip unigram priors only");
}
continue;
}
// Build up "context" ngram:
b = new StringBuilder();
for (int j = tokens.Length - i - 1; j < tokens.Length - 1; j++)
{
b.append(' ');
b.append(tokens[j]);
}
string context = b.toString();
if (context.Length > 0)
{
context = context.Substring(1);
}
if (VERBOSE)
{
Console.WriteLine(" context='" + context + "'");
}
long contextCount;
if (context.Length == 0)
{
contextCount = totTokens;
}
else
{
//int? count = gramCounts.get(i - 1).get(context);
var gramCount = gramCounts[i - 1];
int?count = gramCount.ContainsKey(context) ? gramCount[context] : null;
if (count == null)
{
// We never saw this context:
backoff *= FreeTextSuggester.ALPHA;
if (VERBOSE)
{
Console.WriteLine(" skip: never saw context");
}
continue;
}
contextCount = count.GetValueOrDefault();
}
if (VERBOSE)
{
Console.WriteLine(" contextCount=" + contextCount);
}
IDictionary <string, int?> model = gramCounts[i];
// First pass, gather all predictions for this model:
if (VERBOSE)
{
Console.WriteLine(" find terms w/ prefix=" + tokens[tokens.Length - 1]);
}
List <Lookup.LookupResult> tmp = new List <Lookup.LookupResult>();
foreach (string term in terms)
{
if (term.StartsWith(tokens[tokens.Length - 1], StringComparison.Ordinal))
{
if (VERBOSE)
{
Console.WriteLine(" term=" + term);
}
if (seen.contains(term))
{
if (VERBOSE)
{
Console.WriteLine(" skip seen");
}
continue;
}
string ngram = (context + " " + term).Trim();
//Integer count = model.get(ngram);
int?count = model.ContainsKey(ngram) ? model[ngram] : null;
if (count != null)
{
// LUCENENET NOTE: We need to calculate this as decimal because when using double it can sometimes
// return numbers that are greater than long.MaxValue, which results in a negative long number.
// This is also the way it is being done in the FreeTextSuggester to work around the issue.
Lookup.LookupResult lr = new Lookup.LookupResult(ngram, (long)(long.MaxValue * ((decimal)backoff * (decimal)count / contextCount)));
tmp.Add(lr);
if (VERBOSE)
{
Console.WriteLine(" add tmp key='" + lr.Key + "' score=" + lr.Value);
}
}
}
}
// Second pass, trim to only top N, and fold those
// into overall suggestions:
tmp.Sort(byScoreThenKey);
if (tmp.size() > num)
{
//tmp.subList(num, tmp.size()).clear();
tmp.RemoveRange(num, tmp.size() - num);
}
foreach (Lookup.LookupResult result in tmp)
{
string key = result.Key.toString();
int idx = key.LastIndexOf(' ');
string lastToken;
if (idx != -1)
{
lastToken = key.Substring(idx + 1);
}
else
{
lastToken = key;
}
if (!seen.contains(lastToken))
{
seen.add(lastToken);
expected.Add(result);
if (VERBOSE)
{
Console.WriteLine(" keep key='" + result.Key + "' score=" + result.Value);
}
}
}
backoff *= FreeTextSuggester.ALPHA;
}
expected.Sort(byScoreThenKey);
if (expected.size() > num)
{
expected.RemoveRange(num, expected.size() - num);
}
// Actual:
IList <Lookup.LookupResult> actual = sug.DoLookup(query, num);
if (VERBOSE)
{
Console.WriteLine(" expected: " + expected);
Console.WriteLine(" actual: " + actual);
}
assertEquals(expected.ToString(), actual.ToString());
}
}
/// <summary>
/// Add an element to the tree respecting a size limit
/// </summary>
/// <param name="results"> the tree to add in </param>
/// <param name="result"> the result we try to add </param>
/// <param name="num"> size limit </param>
private static void BoundedTreeAdd(JCG.SortedSet <Lookup.LookupResult> results, Lookup.LookupResult result, int num)
{
if (results.Count >= num)
{
var first = results.Min; // "get" our first object so we don't cross threads
if (first.Value < result.Value)
{
// Code similar to the java TreeMap class
results.Remove(first);
}
else
{
return;
}
}
results.Add(result);
}
public void TestBasicContext()
{
Input[] keys = new Input[] {
new Input("lend me your ear", 8, new BytesRef("foobar"), AsSet("foo", "bar")),
new Input("a penny saved is a penny earned", 10, new BytesRef("foobaz"), AsSet("foo", "baz"))
};
DirectoryInfo tempDir = CreateTempDir("analyzingInfixContext");
for (int iter = 0; iter < 2; iter++)
{
AnalyzingInfixSuggester suggester;
Analyzer a = new MockAnalyzer(Random(), MockTokenizer.WHITESPACE, false);
if (iter == 0)
{
suggester = new AnalyzingInfixSuggester(TEST_VERSION_CURRENT, NewFSDirectory(tempDir), a, a, 3);
suggester.Build(new InputArrayIterator(keys));
}
else
{
// Test again, after close/reopen:
suggester = new AnalyzingInfixSuggester(TEST_VERSION_CURRENT, NewFSDirectory(tempDir), a, a, 3);
}
// No context provided, all results returned
IList <Lookup.LookupResult> results = suggester.DoLookup(TestUtil.StringToCharSequence("ear", Random()).ToString(), 10, true, true);
assertEquals(2, results.size());
Lookup.LookupResult result = results.ElementAt(0);
assertEquals("a penny saved is a penny <b>ear</b>ned", result.key);
assertEquals(10, result.value);
assertEquals(new BytesRef("foobaz"), result.payload);
assertNotNull(result.contexts);
assertEquals(2, result.contexts.Count());
assertTrue(result.contexts.Contains(new BytesRef("foo")));
assertTrue(result.contexts.Contains(new BytesRef("baz")));
result = results.ElementAt(1);
assertEquals("lend me your <b>ear</b>", result.key);
assertEquals(8, result.value);
assertEquals(new BytesRef("foobar"), result.payload);
assertNotNull(result.contexts);
assertEquals(2, result.contexts.Count());
assertTrue(result.contexts.Contains(new BytesRef("foo")));
assertTrue(result.contexts.Contains(new BytesRef("bar")));
// Both suggestions have "foo" context:
results = suggester.DoLookup(TestUtil.StringToCharSequence("ear", Random()).ToString(), AsSet("foo"), 10, true, true);
assertEquals(2, results.size());
result = results.ElementAt(0);
assertEquals("a penny saved is a penny <b>ear</b>ned", result.key);
assertEquals(10, result.value);
assertEquals(new BytesRef("foobaz"), result.payload);
assertNotNull(result.contexts);
assertEquals(2, result.contexts.Count());
assertTrue(result.contexts.Contains(new BytesRef("foo")));
assertTrue(result.contexts.Contains(new BytesRef("baz")));
result = results.ElementAt(1);
assertEquals("lend me your <b>ear</b>", result.key);
assertEquals(8, result.value);
assertEquals(new BytesRef("foobar"), result.payload);
assertNotNull(result.contexts);
assertEquals(2, result.contexts.Count());
assertTrue(result.contexts.Contains(new BytesRef("foo")));
assertTrue(result.contexts.Contains(new BytesRef("bar")));
// Only one has "bar" context:
results = suggester.DoLookup(TestUtil.StringToCharSequence("ear", Random()).ToString(), AsSet("bar"), 10, true, true);
assertEquals(1, results.size());
result = results.ElementAt(0);
assertEquals("lend me your <b>ear</b>", result.key);
assertEquals(8, result.value);
assertEquals(new BytesRef("foobar"), result.payload);
assertNotNull(result.contexts);
assertEquals(2, result.contexts.Count());
assertTrue(result.contexts.Contains(new BytesRef("foo")));
assertTrue(result.contexts.Contains(new BytesRef("bar")));
// Only one has "baz" context:
results = suggester.DoLookup(TestUtil.StringToCharSequence("ear", Random()).ToString(), AsSet("baz"), 10, true, true);
assertEquals(1, results.size());
result = results.ElementAt(0);
assertEquals("a penny saved is a penny <b>ear</b>ned", result.key);
assertEquals(10, result.value);
assertEquals(new BytesRef("foobaz"), result.payload);
assertNotNull(result.contexts);
assertEquals(2, result.contexts.Count());
assertTrue(result.contexts.Contains(new BytesRef("foo")));
assertTrue(result.contexts.Contains(new BytesRef("baz")));
// Both have foo or bar:
results = suggester.DoLookup(TestUtil.StringToCharSequence("ear", Random()).ToString(), AsSet("foo", "bar"), 10, true, true);
assertEquals(2, results.size());
result = results.ElementAt(0);
assertEquals("a penny saved is a penny <b>ear</b>ned", result.key);
assertEquals(10, result.value);
assertEquals(new BytesRef("foobaz"), result.payload);
assertNotNull(result.contexts);
assertEquals(2, result.contexts.Count());
assertTrue(result.contexts.Contains(new BytesRef("foo")));
assertTrue(result.contexts.Contains(new BytesRef("baz")));
result = results.ElementAt(1);
assertEquals("lend me your <b>ear</b>", result.key);
assertEquals(8, result.value);
assertEquals(new BytesRef("foobar"), result.payload);
assertNotNull(result.contexts);
assertEquals(2, result.contexts.Count());
assertTrue(result.contexts.Contains(new BytesRef("foo")));
assertTrue(result.contexts.Contains(new BytesRef("bar")));
suggester.Dispose();
}
}
