Review test matrix

.github/workflows/tests.yml

@@ -5,9 +5,24 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11']
-        h5py-version: ['dev']
-        numpy-version: ['latest', '1.24.4']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        numpy-version: ['latest']
+        ndindex-version: ['latest']
+        h5py-version: ['latest']
+        include:
+        - python-version: '3.9'
+          numpy-version: '1.24.4'
+          ndindex-version: '1.5.1'
+          h5py-version: '3.8.0'
+        - python-version: '3.11'  # numpy 1.24.4 has wheels up to Python 3.11
+          numpy-version: '1.24.4'
+          ndindex-version: 'latest'
+          h5py-version: 'latest'
+        - python-version: '3.13'
+          numpy-version: 'latest'
+          ndindex-version: 'latest'
+          h5py-version: 'dev'
+
       fail-fast: false
     steps:
       - uses: actions/checkout@v4
@@ -22,9 +37,23 @@ jobs:
 
       - name: Install target numpy version
         if: matrix.numpy-version != 'latest'
+        run: pip install numpy~=${{ matrix.numpy-version }}
+
+      - name: Install target ndindex version
+        if: matrix.ndindex-version != 'latest'
+        run: pip install ndindex~=${{ matrix.ndindex-version }}
+
+      - name: Install latest h5py version
+        if: matrix.h5py-version == 'latest'
+        run: |
+          # Build against system-wide libhdf5
+          pip install h5py --no-binary :all:
+
+      - name: Install target h5py version
+        if: matrix.h5py-version != 'latest' && matrix.h5py-version != 'dev'
         run: |
-          pip install numpy~=${{ matrix.numpy-version }}
-          pip list
+          # Build against system-wide libhdf5
+          pip install h5py~=${{ matrix.h5py-version }} --no-binary :all:
 
       - name: Install development h5py version
         if: matrix.h5py-version == 'dev'

docs/installation.rst

@@ -12,7 +12,8 @@ Dependencies
 
 Currently, Versioned HDF5 has the following runtime dependencies:
 
-- ``python>=3.6``
 - ``numpy``
 - ``h5py``
 - ``ndindex``
+
+Refer to ``pyproject.toml`` for minimum supported versions.

pyproject.toml

@@ -15,15 +15,15 @@ authors = [
 ]
 description = "Versioned HDF5 provides a versioned abstraction on top of h5py"
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 classifiers = [
     "Programming Language :: Python :: 3",
     "License :: OSI Approved :: BSD License",
     "Operating System :: OS Independent",
 ]
 dependencies = [
-    "numpy",
-    "h5py",
+    "numpy>=1.24.4",
+    "h5py>=3.8.0",
     "ndindex>=1.5.1",
 ]
 urls = { Homepage = "https://github.com/deshaw/versioned-hdf5" }

versioned_hdf5/backend.py

@@ -1,13 +1,16 @@
 from __future__ import annotations
 
+import datetime
 import logging
 import os
 import textwrap
 from collections.abc import Iterator
 
 import numpy as np
-from h5py import Dataset, VirtualLayout, VirtualSource, h5s, h5z
+from h5py import Dataset, VirtualLayout, h5s, h5z
 from h5py._hl.filters import guess_chunk
+from h5py._hl.selections import select
+from h5py._selector import Selector
 from ndindex import ChunkSize, Slice, Tuple, ndindex
 from numpy.testing import assert_array_equal
 
@@ -32,8 +35,6 @@ def get_chunks(shape, dtype, chunk_size):
 
 
 def initialize(f):
-    import datetime
-
     from .versions import TIMESTAMP_FMT
 
     version_data = f.create_group("_version_data")
@@ -438,70 +439,45 @@ def write_dataset_chunks(f, name, data_dict):
 def create_virtual_dataset(
     f, version_name, name, shape, slices, attrs=None, fillvalue=None
 ):
-    from h5py._hl.selections import select
-    from h5py._hl.vds import VDSmap
+    """Create a new virtual dataset by stitching the chunks of the
+    raw dataset together, as indicated by the slices dict.
 
+    See Also
+    --------
+    _recreate_virtual_dataset
+    """
     raw_data = f["_version_data"][name]["raw_data"]
     raw_data_shape = raw_data.shape
-    slices = {c: s.reduce() for c, s in slices.items()}
+    raw_data_name = raw_data.name.encode("utf-8")
 
     if len(raw_data) == 0:
         layout = VirtualLayout(shape=(0,), dtype=raw_data.dtype)
     else:
+        layout = VirtualLayout(shape, dtype=raw_data.dtype)
+        layout._src_filenames.add(b".")
+        space = h5s.create_simple(shape)
+        selector = Selector(space)
+
         # Chunks in the raw dataset are expanded along the first dimension only.
         # Since the chunks are pointed to by virtual datasets, it doesn't make
         # sense to expand the chunks in the raw dataset along multiple dimensions
         # (the true layout of the chunks in the raw dataset is irrelevant).
-        for c, s in slices.items():
-            if len(c.args[0]) != len(s):
-                raise ValueError(f"Inconsistent slices dictionary ({c.args[0]}, {s})")
-
-        # h5py 3.3 changed the VirtualLayout code so that it no longer uses
-        # sources. See https://github.com/h5py/h5py/pull/1905.
-        layout = VirtualLayout(shape, dtype=raw_data.dtype)
-        layout_has_sources = hasattr(layout, "sources")
-        if not layout_has_sources:
-            from h5py import _selector
-
-            layout._src_filenames.add(b".")
-            space = h5s.create_simple(shape)
-            selector = _selector.Selector(space)
-
-        for c, s in slices.items():
+        for c, s0 in slices.items():
+            if len(c.args[0]) != len(s0):
+                raise ValueError(f"Inconsistent slices dictionary ({c.args[0]}, {s0})")
             if c.isempty():
                 continue
-            # idx = Tuple(s, *Tuple(*[slice(0, i) for i in shape[1:]]).as_subindex(Tuple(*c.args[1:])).args)
-            S = [Slice(0, len(c.args[i])) for i in range(1, len(shape))]
-            idx = Tuple(s, *S)
-            # assert c.newshape(shape) == vs[idx.raw].shape, (c, shape, s)
-
-            # This is equivalent to
-            #
-            # layout[c.raw] = vs[idx.raw]
-            #
-            # but faster because vs[idx.raw] does a deepcopy(vs), which is
-            # slow. We need different versions for h5py 2 and 3 because the
-            # virtual sources code was rewritten.
-            if not layout_has_sources:
-                key = idx.raw
-                vs_sel = select(raw_data.shape, key, dataset=None)
-
-                sel = selector.make_selection(c.raw)
-                layout.dcpl.set_virtual(
-                    sel.id, b".", raw_data.name.encode("utf-8"), vs_sel.id
-                )
 
-            else:
-                vs_sel = select(raw_data_shape, idx.raw, None)
-                layout_sel = select(shape, c.raw, None)
-                layout.sources.append(
-                    VDSmap(layout_sel.id, ".", raw_data.name, vs_sel.id)
-                )
+            s = (s0.reduce().raw, *(slice(0, len(ci), 1) for ci in c.args[1:]))
 
-    dtype = raw_data.dtype
-    if dtype.metadata and (
-        "vlen" in dtype.metadata or "h5py_encoding" in dtype.metadata
-    ):
+            # This is equivalent to `layout[c] = vs[s]`,
+            # but faster because vs[s] deep-copies vs, which is slow.
+            vs_sel = select(raw_data_shape, s, dataset=None)
+            sel = selector.make_selection(c.raw)
+            layout.dcpl.set_virtual(sel.id, b".", raw_data_name, vs_sel.id)
+
+    dtype_meta = raw_data.dtype.metadata
+    if dtype_meta and ("vlen" in dtype_meta or "h5py_encoding" in dtype_meta):
         # Variable length string dtype
         # (https://h5py.readthedocs.io/en/2.10.0/strings.html). Setting the
         # fillvalue in this case doesn't work

versioned_hdf5/replay.py

@@ -12,7 +12,7 @@
 from h5py import __version__ as h5py_version
 from h5py import h5s
 from h5py._hl.selections import select
-from h5py._hl.vds import VDSmap
+from h5py._selector import Selector
 from h5py.h5i import get_name
 from ndindex import ChunkSize, Slice, Tuple
 from ndindex.ndindex import NDIndex
@@ -338,6 +338,9 @@ def _recreate_virtual_dataset(f, name, versions, raw_data_chunks_map, tmp=False)
     are placed alongside the existing ones. Otherwise the existing virtual
     datasets are replaced.
 
+    See Also
+    --------
+    create_virtual_dataset
     """
     raw_data = f["_version_data"][name]["raw_data"]
 
@@ -347,47 +350,32 @@ def _recreate_virtual_dataset(f, name, versions, raw_data_chunks_map, tmp=False)
 
         group = f["_version_data/versions"][version_name]
         dataset = group[name]
-
-        # See the comments in create_virtual_dataset
         layout = VirtualLayout(dataset.shape, dtype=dataset.dtype)
-        layout_has_sources = hasattr(layout, "sources")
-
-        if not layout_has_sources:
-            from h5py import _selector
 
+        # If a dataset has no data except for the fillvalue, it will not be virtual
+        if dataset.is_virtual:
             layout._src_filenames.add(b".")
             space = h5s.create_simple(dataset.shape)
-            selector = _selector.Selector(space)
+            selector = Selector(space)
+            raw_data_shape = raw_data.shape
+            raw_data_name = raw_data.name.encode("utf-8")
 
-        # If a dataset has no data except for the fillvalue, it will not be virtual
-        if dataset.is_virtual:
             virtual_sources = dataset.virtual_sources()
             for vmap in virtual_sources:
-                vspace, fname, dset_name, src_space = vmap
-                fname = fname.encode("utf-8")
-                assert fname == b".", fname
+                vspace, fname, _, src_space = vmap
+                assert fname == "."
 
                 vslice = spaceid_to_slice(vspace)
                 src_slice = spaceid_to_slice(src_space)
                 if src_slice not in raw_data_chunks_map:
                     raise ValueError(
                         f"Could not find the chunk for {vslice} ({src_slice} in the old raw dataset) for {name!r} in {version_name!r}"
                     )
-                new_src_slice = raw_data_chunks_map[src_slice]
-
-                if not layout_has_sources:
-                    key = new_src_slice.raw
-                    vs_sel = select(raw_data.shape, key, dataset=None)
 
-                    sel = selector.make_selection(vslice.raw)
-                    layout.dcpl.set_virtual(
-                        sel.id, b".", raw_data.name.encode("utf-8"), vs_sel.id
-                    )
-                else:
-                    vs_sel = select(raw_data.shape, new_src_slice.raw, None)
-                    layout_sel = select(dataset.shape, vslice.raw, None)
-                    new_vmap = VDSmap(layout_sel.id, fname, dset_name, vs_sel.id)
-                    layout.sources.append(new_vmap)
+                new_src_slice = raw_data_chunks_map[src_slice]
+                vs_sel = select(raw_data_shape, new_src_slice.raw, dataset=None)
+                sel = selector.make_selection(vslice.raw)
+                layout.dcpl.set_virtual(sel.id, b".", raw_data_name, vs_sel.id)
 
         head, tail = posixpath.split(name)
         tmp_name = "_tmp_" + tail
@@ -743,16 +731,12 @@ def _new_vds_layout(d, name1, name2):
                     vspace, fname, dset_name, src_space = vmap
                     assert dset_name.startswith(name1)
                     dset_name = _replace_prefix(dset_name, name1, name2)
-                    fname = fname.encode("utf-8")
-                    new_vmap = VDSmap(vspace, fname, dset_name, src_space)
-                    # h5py 3.3 changed the VirtualLayout code. See
-                    # https://github.com/h5py/h5py/pull/1905.
-                    if hasattr(layout, "sources"):
-                        layout.sources.append(new_vmap)
-                    else:
-                        layout.dcpl.set_virtual(
-                            vspace, fname, dset_name.encode("utf-8"), src_space
-                        )
+                    layout.dcpl.set_virtual(
+                        vspace,
+                        fname.encode("utf-8"),
+                        dset_name.encode("utf-8"),
+                        src_space,
+                    )
                 return layout
 
             old_layout = _new_vds_layout(oldd, old.name, new.name)