fix(python): install the _zvec extension inside the zvec package

CMakeLists.txt

@@ -171,18 +171,22 @@ if(BUILD_PYTHON_BINDINGS)
     endif()
 
     message(STATUS "Zvec install path: ${ZVEC_PY_INSTALL_DIR}")
-    install(TARGETS _zvec LIBRARY DESTINATION ${ZVEC_PY_INSTALL_DIR})
+    # Install the extension inside the zvec package (zvec/_zvec*.so) rather than
+    # at the site-packages root, so it does not pollute the top-level namespace.
+    # The Python code imports it as `zvec._zvec` accordingly.
+    install(TARGETS _zvec LIBRARY DESTINATION ${ZVEC_PY_INSTALL_DIR}/zvec)
 
     # DiskAnn ships as a runtime-loaded shared module
     # (libzvec_diskann_plugin.so) that is brought online implicitly the
     # first time a DiskAnn index is created — users never call any load
     # function. The Python extension resolves the module next to _zvec.so
     # (see the $ORIGIN rpath in src/binding/python/CMakeLists.txt); the
-    # module must therefore be installed alongside _zvec.so in the wheel.
+    # module must therefore be installed alongside _zvec.so, i.e. inside the
+    # zvec package directory as well.
     # The target exists only on platforms where DiskAnn is buildable
     # (currently Linux x86_64 with libaio).
     if(TARGET core_knn_diskann)
-        install(TARGETS core_knn_diskann LIBRARY DESTINATION ${ZVEC_PY_INSTALL_DIR})
+        install(TARGETS core_knn_diskann LIBRARY DESTINATION ${ZVEC_PY_INSTALL_DIR}/zvec)
     endif()
     # Bundle cppjieba's dictionary files so the `jieba` FTS tokenizer works
     # out of the box. python/zvec/__init__.py resolves this directory via

python/tests/test_convert.py

@@ -3,7 +3,7 @@
 import math
 
 import pytest
-from _zvec import _Doc
+from zvec._zvec import _Doc
 from zvec.model.convert import convert_to_py_doc, convert_to_cpp_doc
 from zvec import Doc, CollectionSchema, DataType, FieldSchema, VectorSchema
 

python/tests/test_doc.py

@@ -17,7 +17,7 @@
 import pytest
 
 
-from _zvec import _Doc
+from zvec._zvec import _Doc
 from zvec import FieldSchema, VectorSchema, Doc, DataType
 
 

python/tests/test_fts_query.py

@@ -79,15 +79,15 @@ class TestFtsQueryBinding:
 
     def test_import_fts_query(self):
         """_Fts should be importable from _zvec.param."""
-        from _zvec.param import _Fts
+        from zvec._zvec.param import _Fts
 
         fts = _Fts()
         assert fts.query_string == ""
         assert fts.match_string == ""
 
     def test_fts_query_set_fields(self):
         """Setting fields on _Fts should work."""
-        from _zvec.param import _Fts
+        from zvec._zvec.param import _Fts
 
         fts = _Fts()
         fts.query_string = "+hello -world"
@@ -99,7 +99,7 @@ def test_fts_query_set_fields(self):
 
     def test_fts_query_pickle(self):
         """_Fts should support pickling."""
-        from _zvec.param import _Fts
+        from zvec._zvec.param import _Fts
 
         fts = _Fts()
         fts.query_string = "+vector search"
@@ -112,7 +112,7 @@ def test_fts_query_pickle(self):
 
     def test_search_query_fts_field(self):
         """_SearchQuery should have fts field."""
-        from _zvec.param import _Fts, _SearchQuery
+        from zvec._zvec.param import _Fts, _SearchQuery
 
         vq = _SearchQuery()
         # fts should be None by default (optional)
@@ -127,7 +127,7 @@ def test_search_query_fts_field(self):
 
     def test_search_query_pickle_with_fts(self):
         """_SearchQuery with fts should survive pickling."""
-        from _zvec.param import _Fts, _SearchQuery
+        from zvec._zvec.param import _Fts, _SearchQuery
 
         vq = _SearchQuery()
         vq.topk = 10
@@ -145,7 +145,7 @@ def test_search_query_pickle_with_fts(self):
 
     def test_search_query_pickle_without_fts(self):
         """_SearchQuery without fts should survive pickling."""
-        from _zvec.param import _SearchQuery
+        from zvec._zvec.param import _SearchQuery
 
         vq = _SearchQuery()
         vq.topk = 5

python/tests/test_params.py

@@ -40,7 +40,7 @@
     VectorSchema,
 )
 
-from _zvec.param import _SearchQuery
+from zvec._zvec.param import _SearchQuery
 
 # ----------------------------
 # Invert Index Param Test Case

python/tests/test_query_executor.py

@@ -18,7 +18,7 @@
 
 import numpy as np
 import math
-from _zvec.param import _SearchQuery
+from zvec._zvec.param import _SearchQuery
 
 import pytest
 from zvec.executor.query_executor import (

python/zvec/__init__.py

@@ -28,7 +28,7 @@
 try:
     from importlib.resources import files as _resource_files
 
-    from _zvec import (
+    from zvec._zvec import (
         get_default_jieba_dict_dir,
         set_default_jieba_dict_dir,
     )
@@ -48,7 +48,7 @@
 # DiskAnn normally auto-loads on first use; these APIs let tests and
 # diagnostic tools preload the plugin and get a clear error if libaio is
 # missing or the plugin shared object cannot be located.
-from _zvec import (
+from zvec._zvec import (
     DISKANN_PLUGIN_DLOPEN_FAILED,
     DISKANN_PLUGIN_LIBAIO_MISSING,
     DISKANN_PLUGIN_OK,

python/zvec/executor/query_executor.py

@@ -16,8 +16,9 @@
 from typing import Optional, Union
 
 import numpy as np
-from _zvec import _Collection, _MultiQuery
-from _zvec.param import _Fts, _SearchQuery, _SubQuery
+
+from zvec._zvec import _Collection, _MultiQuery
+from zvec._zvec.param import _Fts, _SearchQuery, _SubQuery
 
 from ..extension import CallbackReRanker, ReRanker, RrfReRanker, WeightedReRanker
 from ..model.convert import convert_to_py_doc

python/zvec/extension/multi_vector_reranker.py

@@ -16,7 +16,13 @@
 from collections.abc import Callable
 from typing import TYPE_CHECKING
 
-from _zvec import _CallbackParams, _Doc, _reranker_rerank, _RrfParams, _WeightedParams
+from zvec._zvec import (
+    _CallbackParams,
+    _Doc,
+    _reranker_rerank,
+    _RrfParams,
+    _WeightedParams,
+)
 
 from ..model.doc import Doc, DocList
 from .rerank_function import RerankFunction

python/zvec/model/collection.py

@@ -16,7 +16,7 @@
 import warnings
 from typing import Optional, Union, overload
 
-from _zvec import _Collection
+from zvec._zvec import _Collection
 
 from ..executor import QueryContext, QueryExecutor
 from ..extension import ReRanker

python/zvec/model/convert.py

@@ -11,7 +11,7 @@
 # limitations under the License.
 from __future__ import annotations
 
-from _zvec import _Doc
+from zvec._zvec import _Doc
 
 from .doc import Doc
 from .schema import CollectionSchema

python/zvec/model/param/__init__.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 from __future__ import annotations
 
-from _zvec.param import (
+from zvec._zvec.param import (
     AddColumnOption,
     AlterColumnOption,
     CollectionOption,

python/zvec/model/param/__init__.pyi

@@ -7,7 +7,7 @@ from __future__ import annotations
 import collections
 import typing
 
-import _zvec.typing
+import zvec._zvec.typing
 
 __all__: list[str] = [
     "AddColumnOption",
@@ -159,8 +159,8 @@ class FlatIndexParam(VectorIndexParam):
     def __getstate__(self) -> tuple: ...
     def __init__(
         self,
-        metric_type: _zvec.typing.MetricType = ...,
-        quantize_type: _zvec.typing.QuantizeType = ...,
+        metric_type: zvec._zvec.typing.MetricType = ...,
+        quantize_type: zvec._zvec.typing.QuantizeType = ...,
     ) -> None:
         """
         Constructs a FlatIndexParam instance.
@@ -219,10 +219,10 @@ class HnswIndexParam(VectorIndexParam):
     def __getstate__(self) -> tuple: ...
     def __init__(
         self,
-        metric_type: _zvec.typing.MetricType = ...,
+        metric_type: zvec._zvec.typing.MetricType = ...,
         m: typing.SupportsInt = 50,
         ef_construction: typing.SupportsInt = 500,
-        quantize_type: _zvec.typing.QuantizeType = ...,
+        quantize_type: zvec._zvec.typing.QuantizeType = ...,
         use_contiguous_memory: bool = False,
     ) -> None: ...
     def __repr__(self) -> str: ...
@@ -363,7 +363,7 @@ class HnswRabitqIndexParam(VectorIndexParam):
     def __getstate__(self) -> tuple: ...
     def __init__(
         self,
-        metric_type: _zvec.typing.MetricType = ...,
+        metric_type: zvec._zvec.typing.MetricType = ...,
         total_bits: typing.SupportsInt = 7,
         num_clusters: typing.SupportsInt = 16,
         m: typing.SupportsInt = 50,
@@ -491,11 +491,11 @@ class IVFIndexParam(VectorIndexParam):
     def __getstate__(self) -> tuple: ...
     def __init__(
         self,
-        metric_type: _zvec.typing.MetricType = ...,
+        metric_type: zvec._zvec.typing.MetricType = ...,
         n_list: typing.SupportsInt = 10,
         n_iters: typing.SupportsInt = 10,
         use_soar: bool = False,
-        quantize_type: _zvec.typing.QuantizeType = ...,
+        quantize_type: zvec._zvec.typing.QuantizeType = ...,
     ) -> None:
         """
         Constructs an IVFIndexParam instance.
@@ -593,14 +593,14 @@ class VamanaIndexParam(VectorIndexParam):
     def __getstate__(self) -> tuple: ...
     def __init__(
         self,
-        metric_type: _zvec.typing.MetricType = ...,
+        metric_type: zvec._zvec.typing.MetricType = ...,
         max_degree: typing.SupportsInt = 64,
         search_list_size: typing.SupportsInt = 100,
         alpha: typing.SupportsFloat = 1.2,
         saturate_graph: bool = False,
         use_contiguous_memory: bool = False,
         use_id_map: bool = False,
-        quantize_type: _zvec.typing.QuantizeType = ...,
+        quantize_type: zvec._zvec.typing.QuantizeType = ...,
     ) -> None: ...
     def __repr__(self) -> str: ...
     def __setstate__(self, arg0: tuple) -> None: ...
@@ -734,7 +734,7 @@ class IndexParam:
         """
 
     @property
-    def type(self) -> _zvec.typing.IndexType:
+    def type(self) -> zvec._zvec.typing.IndexType:
         """
         IndexType: The type of the index.
         """
@@ -863,7 +863,7 @@ class QueryParam:
         IndexType: The type of index this query targets.
         """
     @property
-    def type(self) -> _zvec.typing.IndexType:
+    def type(self) -> zvec._zvec.typing.IndexType:
         """
         IndexType: The type of index this query targets.
         """
@@ -933,13 +933,13 @@ class VectorIndexParam(IndexParam):
         """
 
     @property
-    def metric_type(self) -> _zvec.typing.MetricType:
+    def metric_type(self) -> zvec._zvec.typing.MetricType:
         """
         MetricType: Distance metric (e.g., IP, COSINE, L2).
         """
 
     @property
-    def quantize_type(self) -> _zvec.typing.QuantizeType:
+    def quantize_type(self) -> zvec._zvec.typing.QuantizeType:
         """
         QuantizeType: Vector quantization type (e.g., FP16, INT8).
         """

python/zvec/model/schema/__init__.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 from __future__ import annotations
 
-from _zvec.schema import CollectionStats
+from zvec._zvec.schema import CollectionStats
 
 from .collection_schema import CollectionSchema
 from .field_schema import FieldSchema, VectorSchema

python/zvec/model/schema/__init__.pyi

@@ -7,8 +7,8 @@ from __future__ import annotations
 import collections.abc
 import typing
 
-import _zvec.param
-import _zvec.typing
+import zvec._zvec.param
+import zvec._zvec.typing
 
 from .collection_schema import CollectionSchema
 from .field_schema import FieldSchema, VectorSchema
@@ -85,20 +85,20 @@ class _FieldSchema:
     def __init__(
         self,
         name: str,
-        data_type: _zvec.typing.DataType,
+        data_type: zvec._zvec.typing.DataType,
         nullable: bool = False,
         dimension: typing.SupportsInt = 0,
-        index_param: _zvec.param.IndexParam = None,
+        index_param: zvec._zvec.param.IndexParam = None,
     ) -> None: ...
     def __ne__(self, arg0: _FieldSchema) -> bool: ...
     @property
-    def data_type(self) -> _zvec.typing.DataType: ...
+    def data_type(self) -> zvec._zvec.typing.DataType: ...
     @property
     def dimension(self) -> int: ...
     @property
     def index_param(self) -> typing.Any: ...
     @property
-    def index_type(self) -> _zvec.typing.IndexType: ...
+    def index_type(self) -> zvec._zvec.typing.IndexType: ...
     @property
     def is_dense_vector(self) -> bool: ...
     @property

python/zvec/model/schema/collection_schema.py

@@ -16,7 +16,7 @@
 import json
 from typing import Optional, Union
 
-from _zvec.schema import _CollectionSchema, _FieldSchema
+from zvec._zvec.schema import _CollectionSchema, _FieldSchema
 
 from .field_schema import FieldSchema, VectorSchema
 

python/zvec/model/schema/field_schema.py

@@ -16,8 +16,7 @@
 import json
 from typing import Any, Optional, Union
 
-from _zvec.schema import _FieldSchema
-
+from zvec._zvec.schema import _FieldSchema
 from zvec.model.param import (
     FlatIndexParam,
     HnswIndexParam,

python/zvec/typing/__init__.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 from __future__ import annotations
 
-from _zvec.typing import (
+from zvec._zvec.typing import (
     DataType,
     IndexType,
     MetricType,

python/zvec/zvec.py

@@ -15,7 +15,7 @@
 
 from typing import Optional
 
-from _zvec import Initialize, _Collection
+from zvec._zvec import Initialize, _Collection
 
 from .model import Collection
 from .model.param import CollectionOption