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/*
* Copyright 2017 - 2023 John Snow Labs
*
* 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 com.johnsnowlabs.ml.ai
import ai.onnxruntime.{OnnxTensor, TensorInfo}
import com.johnsnowlabs.ml.onnx.{OnnxSession, OnnxWrapper}
import com.johnsnowlabs.ml.tensorflow.{TensorResources, TensorflowWrapper}
import com.johnsnowlabs.ml.tensorflow.sign.{ModelSignatureConstants, ModelSignatureManager}
import com.johnsnowlabs.ml.util.{LinAlg, ONNX, TensorFlow}
import com.johnsnowlabs.nlp.annotators.common._
import com.johnsnowlabs.nlp.{Annotation, AnnotatorType}
import scala.collection.JavaConverters._
import scala.util.Try
/** SnowFlake Sentence embeddings model
* @param tensorflowWrapper
* tensorflow wrapper
* @param configProtoBytes
* config proto bytes
* @param sentenceStartTokenId
* sentence start token id
* @param sentenceEndTokenId
* sentence end token id
* @param signatures
* signatures
*/
private[johnsnowlabs] class SnowFlake(
val tensorflowWrapper: Option[TensorflowWrapper],
val onnxWrapper: Option[OnnxWrapper],
configProtoBytes: Option[Array[Byte]] = None,
sentenceStartTokenId: Int,
sentenceEndTokenId: Int,
signatures: Option[Map[String, String]] = None) {
private val _tfInstructorSignatures: Map[String, String] =
signatures.getOrElse(ModelSignatureManager.apply())
private val paddingTokenId = 0
val detectedEngine: String =
if (tensorflowWrapper.isDefined) TensorFlow.name
else if (onnxWrapper.isDefined) ONNX.name
else TensorFlow.name
private val onnxSessionOptions: Map[String, String] = new OnnxSession().getSessionOptions
/** Get sentence embeddings for a batch of sentences
*
* @param batch
* batch of sentences
* @return
* sentence embeddings
*/
private def getSentenceEmbedding(
batch: Seq[Array[Int]],
poolingStrategy: String): Array[Array[Float]] = {
val maxSentenceLength = batch.map(pieceIds => pieceIds.length).max
val paddedBatch = batch.map(arr => padArrayWithZeros(arr, maxSentenceLength))
val sentenceEmbeddings: Array[Array[Float]] = detectedEngine match {
case ONNX.name =>
getSentenceEmbeddingFromOnnx(paddedBatch, maxSentenceLength, poolingStrategy)
case _ => // TF Case
getSentenceEmbeddingFromTF(paddedBatch, maxSentenceLength, poolingStrategy)
}
sentenceEmbeddings
}
/** Pools word embeddings to sentence embeddings given a strategy.
*
* @param embeddings
* A 3D array of Floats representing the embeddings. The dimensions are [batch_size,
* sequence_length, embedding_dim].
* @param attentionMask
* A 2D array of Longs representing the attention mask. The dimensions are [batch_size,
* sequence_length].
* @param poolingStrategy
* A String representing the pooling strategy to be applied. The following strategies are
* supported:
*
* - `"cls"`: leading `[CLS]` token
* - `"cls_avg"`: leading `[CLS]` token + mean of all other tokens
* - `"last"`: embeddings of the last token in the sequence
* - `"avg"`: mean of all tokens
* - `"max"`: max of all embedding values for the token sequence
* - `"int"`: An integer number, which represents the index of the token to use as the
* embedding
* @return
* A 2D array of Floats representing the pooled embeddings. The dimensions are [batch_size,
* embedding_dim].
*/
private def pool(
embeddings: Array[Array[Array[Float]]],
attentionMask: Array[Array[Long]],
poolingStrategy: String): Array[Array[Float]] = {
poolingStrategy match {
case "cls" => LinAlg.clsPooling(embeddings, attentionMask)
case "cls_avg" => LinAlg.clsAvgPooling(embeddings, attentionMask)
case "last" => LinAlg.lastPooling(embeddings, attentionMask)
case "avg" =>
val shape: Array[Long] =
Array(embeddings.length, embeddings.head.length, embeddings.head.head.length)
val avgPooled = LinAlg.avgPooling(embeddings.flatten.flatten, attentionMask, shape)
avgPooled.t.toArray.grouped(avgPooled.cols).toArray
case "max" => LinAlg.maxPooling(embeddings, attentionMask)
case index if Try(index.toInt).isSuccess => LinAlg.tokenPooling(embeddings, index.toInt)
case _ =>
throw new IllegalArgumentException(s"Pooling strategy $poolingStrategy not supported.")
}
}
private def padArrayWithZeros(arr: Array[Int], maxLength: Int): Array[Int] = {
if (arr.length >= maxLength) {
arr
} else {
arr ++ Array.fill(maxLength - arr.length)(0)
}
}
private def getSentenceEmbeddingFromTF(
batch: Seq[Array[Int]],
maxSentenceLength: Int,
poolingStrategy: String): Array[Array[Float]] = {
val batchLength = batch.length
// encode batch
val tensorEncoder = new TensorResources()
val inputDim = batch.length * maxSentenceLength
// create buffers
val encoderInputBuffers = tensorEncoder.createIntBuffer(inputDim)
val encoderAttentionMaskBuffers = tensorEncoder.createIntBuffer(inputDim)
val shape = Array(batch.length.toLong, maxSentenceLength)
batch.zipWithIndex.foreach { case (tokenIds, idx) =>
val offset = idx * maxSentenceLength
val diff = maxSentenceLength - tokenIds.length
// pad with 0
val s = tokenIds.take(maxSentenceLength) ++ Array.fill[Int](diff)(this.paddingTokenId)
encoderInputBuffers.offset(offset).write(s)
// create attention mask
val mask = s.map(x => if (x != this.paddingTokenId) 1 else 0)
encoderAttentionMaskBuffers.offset(offset).write(mask)
}
// create tensors
val encoderInputTensors = tensorEncoder.createIntBufferTensor(shape, encoderInputBuffers)
val encoderAttentionMaskTensors =
tensorEncoder.createIntBufferTensor(shape, encoderAttentionMaskBuffers)
// run model
val runner = tensorflowWrapper.get
.getTFSessionWithSignature(
configProtoBytes = configProtoBytes,
initAllTables = false,
savedSignatures = signatures)
.runner
runner
.feed(
_tfInstructorSignatures.getOrElse(
ModelSignatureConstants.EncoderInputIds.key,
"missing_encoder_input_ids"),
encoderInputTensors)
.feed(
_tfInstructorSignatures.getOrElse(
ModelSignatureConstants.EncoderAttentionMask.key,
"missing_encoder_attention_mask"),
encoderAttentionMaskTensors)
.fetch(_tfInstructorSignatures
.getOrElse(ModelSignatureConstants.LastHiddenState.key, "missing_last_hidden_state"))
// get embeddings
val sentenceEmbeddings = runner.run().asScala
val sentenceEmbeddingsFloats = TensorResources.extractFloats(sentenceEmbeddings.head)
val embeddingDim = sentenceEmbeddingsFloats.length / maxSentenceLength / batchLength
// group embeddings
val sentenceEmbeddingsFloatsArray =
sentenceEmbeddingsFloats.grouped(embeddingDim).toArray.grouped(maxSentenceLength).toArray
val attentionMask: Array[Array[Long]] =
TensorResources.extractLongs(encoderAttentionMaskTensors).grouped(maxSentenceLength).toArray
// close buffers
sentenceEmbeddings.foreach(_.close())
encoderInputTensors.close()
encoderAttentionMaskTensors.close()
tensorEncoder.clearTensors()
tensorEncoder.clearSession(sentenceEmbeddings)
pool(sentenceEmbeddingsFloatsArray, attentionMask, poolingStrategy)
}
private def getSentenceEmbeddingFromOnnx(
batch: Seq[Array[Int]],
maxSentenceLength: Int,
poolingStrategy: String): Array[Array[Float]] = {
val inputIds = batch.map(x => x.map(x => x.toLong)).toArray
val attentionMask = batch.map(sentence => sentence.map(x => if (x < 0L) 0L else 1L)).toArray
val (runner, env) = onnxWrapper.get.getSession(onnxSessionOptions)
val tokenTensors = OnnxTensor.createTensor(env, inputIds)
val maskTensors = OnnxTensor.createTensor(env, attentionMask)
val segmentTensors =
OnnxTensor.createTensor(env, batch.map(x => Array.fill(maxSentenceLength)(0L)).toArray)
val inputs =
Map(
"input_ids" -> tokenTensors,
"attention_mask" -> maskTensors,
"token_type_ids" -> segmentTensors).asJava
val embeddings =
try {
val results = runner.run(inputs)
val lastHiddenState = results.get("last_hidden_state").get()
val info = lastHiddenState.getInfo.asInstanceOf[TensorInfo]
val shape = info.getShape.map(_.toInt)
val Array(_, sequenceLength, embeddingDim) = shape
try {
val flattenEmbeddings = lastHiddenState
.asInstanceOf[OnnxTensor]
.getFloatBuffer
.array()
tokenTensors.close()
maskTensors.close()
segmentTensors.close()
flattenEmbeddings.grouped(embeddingDim).toArray.grouped(sequenceLength).toArray
} finally if (results != null) results.close()
}
pool(embeddings, attentionMask, poolingStrategy)
}
/** Predict sentence embeddings for a batch of sentences
*
* @param sentences
* sentences
* @param tokenizedSentences
* tokenized sentences
* @param batchSize
* batch size
* @param maxSentenceLength
* max sentence length
* @return
*/
def predict(
sentences: Seq[Annotation],
tokenizedSentences: Seq[WordpieceTokenizedSentence],
batchSize: Int,
maxSentenceLength: Int,
poolingStrategy: String): Seq[Annotation] = {
tokenizedSentences
.zip(sentences)
.zipWithIndex
.grouped(batchSize)
.toArray
.flatMap { batch =>
val tokensBatch = batch.map(x => x._1._1.tokens)
val tokens = tokensBatch.map(x =>
Array(sentenceStartTokenId) ++ x
.map(y => y.pieceId)
.take(maxSentenceLength - 2) ++ Array(sentenceEndTokenId))
val sentenceEmbeddings = getSentenceEmbedding(tokens, poolingStrategy)
batch.zip(sentenceEmbeddings).map { case (sentence, vectors) =>
Annotation(
annotatorType = AnnotatorType.SENTENCE_EMBEDDINGS,
begin = sentence._1._2.begin,
end = sentence._1._2.end,
result = sentence._1._2.result,
metadata = sentence._1._2.metadata,
embeddings = vectors)
}
}
}
}
