Add ArcticEmbedLEncoder (#2694)

src/main/java/io/anserini/encoder/dense/ArcticEmbedLEncoder.java

@@ -0,0 +1,78 @@
+/*
+ * Anserini: A Lucene toolkit for reproducible information retrieval research
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+ package io.anserini.encoder.dense;
+
+ import java.io.IOException;
+ import java.net.URISyntaxException;
+ import java.util.ArrayList;
+ import java.util.Arrays;
+ import java.util.HashMap;
+ import java.util.List;
+ import java.util.Map;
+
+ import ai.onnxruntime.OnnxTensor;
+ import ai.onnxruntime.OrtException;
+ import ai.onnxruntime.OrtSession;
+
+ /**
+  * ArcticEmbedL
+  */
+ public class ArcticEmbedLEncoder extends DenseEncoder {
+   static private final String MODEL_URL = "https://rgw.cs.uwaterloo.ca/pyserini/data/arctic-embed-l-official.onnx";
+   static private final String VOCAB_URL = "https://rgw.cs.uwaterloo.ca/pyserini/data/arctic-embed-l-official-vocab.txt";
+
+   static private final String MODEL_NAME = "snowflake-arctic-embed-l-official.onnx";
+   static private final String VOCAB_NAME = "snowflake-arctic-embed-l-vocab.txt";
+
+   static private final String INSTRUCTION = "Represent this sentence for searching relevant passages: ";
+   static private final int MAX_SEQ_LEN = 512;
+   static private final int EMBEDDING_DIM = 1024;
+
+   public ArcticEmbedLEncoder() throws IOException, OrtException, URISyntaxException {
+     super(MODEL_NAME, MODEL_URL, VOCAB_NAME, VOCAB_URL);
+   }
+
+   @Override
+   public float[] encode(String query) throws OrtException {
+     List<String> queryTokens = new ArrayList<>();
+     queryTokens.add("[CLS]");
+     queryTokens.addAll(tokenizer.tokenize(INSTRUCTION + query));
+     queryTokens.add("[SEP]");
+
+     Map<String, OnnxTensor> inputs = new HashMap<>();
+     long[] queryTokenIds = convertTokensToIds(tokenizer, queryTokens, vocab, MAX_SEQ_LEN);
+     long[][] inputTokenIds = new long[1][queryTokenIds.length];
+     inputTokenIds[0] = queryTokenIds;
+
+     long[][] attentionMask = new long[1][queryTokenIds.length];
+     long[][] tokenTypeIds = new long[1][queryTokenIds.length];
+     Arrays.fill(attentionMask[0], 1);
+
+     inputs.put("input_ids", OnnxTensor.createTensor(environment, inputTokenIds));
+     inputs.put("token_type_ids", OnnxTensor.createTensor(environment, tokenTypeIds));
+     inputs.put("attention_mask", OnnxTensor.createTensor(environment, attentionMask));
+
+     float[] embeddings = new float[EMBEDDING_DIM];
+     try (OrtSession.Result results = session.run(inputs)) {
+       float[][][] tensorData = (float[][][]) ((OnnxTensor) results.get(0)).getValue();
+       System.arraycopy(tensorData[0][0], 0, embeddings, 0, EMBEDDING_DIM);
+       return normalize(embeddings);
+     } catch (OrtException e) {
+       throw e;
+     }
+   }
+ }