Add Vertex embeddings to RAG package.

sdks/python/apache_beam/ml/rag/embeddings/huggingface_test.py

@@ -16,6 +16,7 @@
 
 """Tests for apache_beam.ml.rag.embeddings.huggingface."""
 
+import shutil
 import tempfile
 import unittest
 
@@ -73,6 +74,9 @@ def setUp(self):
             })
     ]
 
+  def tearDown(self) -> None:
+    shutil.rmtree(self.artifact_location)
+
   def test_embedding_pipeline(self):
     expected = [
         Chunk(

sdks/python/apache_beam/ml/rag/embeddings/vertex_ai.py

@@ -0,0 +1,97 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+
+
+# Vertex AI Python SDK is required for this module.
+# Follow https://cloud.google.com/vertex-ai/docs/python-sdk/use-vertex-ai-python-sdk # pylint: disable=line-too-long
+# to install Vertex AI Python SDK.
+
+"""RAG-specific embedding implementations using Vertex AI models."""
+
+from typing import Optional
+
+from google.auth.credentials import Credentials
+
+import apache_beam as beam
+from apache_beam.ml.inference.base import RunInference
+from apache_beam.ml.rag.embeddings.base import create_rag_adapter
+from apache_beam.ml.rag.types import Chunk
+from apache_beam.ml.transforms.base import EmbeddingsManager
+from apache_beam.ml.transforms.base import _TextEmbeddingHandler
+from apache_beam.ml.transforms.embeddings.vertex_ai import DEFAULT_TASK_TYPE
+from apache_beam.ml.transforms.embeddings.vertex_ai import _VertexAITextEmbeddingHandler
+
+try:
+  import vertexai
+except ImportError:
+  vertexai = None
+
+
+class VertexAITextEmbeddings(EmbeddingsManager):
+  def __init__(
+      self,
+      model_name: str,
+      *,
+      title: Optional[str] = None,
+      task_type: str = DEFAULT_TASK_TYPE,
+      project: Optional[str] = None,
+      location: Optional[str] = None,
+      credentials: Optional[Credentials] = None,
+      **kwargs):
+    """Utilizes Vertex AI text embeddings for semantic search and RAG
+        pipelines.
+
+        Args:
+            model_name: Name of the Vertex AI text embedding model
+            title: Optional title for the text content
+            task_type: Task type for embeddings (default: RETRIEVAL_DOCUMENT)
+            project: GCP project ID
+            location: GCP location
+            credentials: Optional GCP credentials
+            **kwargs: Additional arguments passed to EmbeddingsManager including
+            ModelHandler inference_args.
+        """
+    if not vertexai:
+      raise ImportError(
+          "vertexai is required to use VertexAITextEmbeddings. "
+          "Please install it with `pip install google-cloud-aiplatform`")
+
+    super().__init__(type_adapter=create_rag_adapter(), **kwargs)
+    self.model_name = model_name
+    self.title = title
+    self.task_type = task_type
+    self.project = project
+    self.location = location
+    self.credentials = credentials
+
+  def get_model_handler(self):
+    """Returns model handler configured with RAG adapter."""
+    return _VertexAITextEmbeddingHandler(
+        model_name=self.model_name,
+        title=self.title,
+        task_type=self.task_type,
+        project=self.project,
+        location=self.location,
+        credentials=self.credentials,
+    )
+
+  def get_ptransform_for_processing(
+      self, **kwargs
+  ) -> beam.PTransform[beam.PCollection[Chunk], beam.PCollection[Chunk]]:
+    """Returns PTransform that uses the RAG adapter."""
+    return RunInference(
+        model_handler=_TextEmbeddingHandler(self),
+        inference_args=self.inference_args).with_output_types(Chunk)

sdks/python/apache_beam/ml/rag/embeddings/vertex_ai_test.py

@@ -0,0 +1,110 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+
+"""Tests for apache_beam.ml.rag.embeddings.vertex_ai."""
+
+import shutil
+import tempfile
+import unittest
+
+import apache_beam as beam
+from apache_beam.ml.rag.types import Chunk
+from apache_beam.ml.rag.types import Content
+from apache_beam.ml.rag.types import Embedding
+from apache_beam.ml.transforms.base import MLTransform
+from apache_beam.testing.test_pipeline import TestPipeline
+from apache_beam.testing.util import assert_that
+from apache_beam.testing.util import equal_to
+
+# pylint: disable=ungrouped-imports
+try:
+  import vertexai  # pylint: disable=unused-import
+  from apache_beam.ml.rag.embeddings.vertex_ai import VertexAITextEmbeddings
+  VERTEX_AI_AVAILABLE = True
+except ImportError:
+  VERTEX_AI_AVAILABLE = False
+
+
+def chunk_approximately_equals(expected, actual):
+  """Compare embeddings allowing for numerical differences."""
+  if not isinstance(expected, Chunk) or not isinstance(actual, Chunk):
+    return False
+
+  return (
+      expected.id == actual.id and expected.metadata == actual.metadata and
+      expected.content == actual.content and
+      len(expected.embedding.dense_embedding) == len(
+          actual.embedding.dense_embedding) and
+      all(isinstance(x, float) for x in actual.embedding.dense_embedding))
+
+
+@unittest.skipIf(
+    not VERTEX_AI_AVAILABLE, "Vertex AI dependencies not available")
+class VertexAITextEmbeddingsTest(unittest.TestCase):
+  def setUp(self):
+    self.artifact_location = tempfile.mkdtemp(prefix='vertex_ai_')
+    self.test_chunks = [
+        Chunk(
+            content=Content(text="This is a test sentence."),
+            id="1",
+            metadata={
+                "source": "test.txt", "language": "en"
+            }),
+        Chunk(
+            content=Content(text="Another example."),
+            id="2",
+            metadata={
+                "source": "test.txt", "language": "en"
+            })
+    ]
+
+  def tearDown(self) -> None:
+    shutil.rmtree(self.artifact_location)
+
+  def test_embedding_pipeline(self):
+    # gecko@002 produces 768-dimensional embeddings
+    expected = [
+        Chunk(
+            id="1",
+            embedding=Embedding(dense_embedding=[0.0] * 768),
+            metadata={
+                "source": "test.txt", "language": "en"
+            },
+            content=Content(text="This is a test sentence.")),
+        Chunk(
+            id="2",
+            embedding=Embedding(dense_embedding=[0.0] * 768),
+            metadata={
+                "source": "test.txt", "language": "en"
+            },
+            content=Content(text="Another example."))
+    ]
+
+    embedder = VertexAITextEmbeddings(model_name="textembedding-gecko@002")
+
+    with TestPipeline() as p:
+      embeddings = (
+          p
+          | beam.Create(self.test_chunks)
+          | MLTransform(write_artifact_location=self.artifact_location).
+          with_transform(embedder))
+
+      assert_that(
+          embeddings, equal_to(expected, equals_fn=chunk_approximately_equals))
+
+
+if __name__ == '__main__':
+  unittest.main()