Merge branch 'master' into master

ddhawan11 · Jan 30, 2024 · 2b971e0 · 2b971e0
2 parents 49c6678 + bb0bf88
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diff --git a/doc/releases/changelog-dev.md b/doc/releases/changelog-dev.md
@@ -246,6 +246,9 @@
 * A typo in a code example in the `qml.transforms` API has been fixed.
   [(#5014)](https://github.com/PennyLaneAI/pennylane/pull/5014)
 
+* Documentation `qml.data` has been updated and now mentions a way to access the same dataset simultaneously from multiple environments.
+  [(#5029)](https://github.com/PennyLaneAI/pennylane/pull/5029)
+
 * Clarification for the definition of `argnum` added to gradient methods
   [(#5035)](https://github.com/PennyLaneAI/pennylane/pull/5035)
 
@@ -301,6 +304,7 @@ Gabriel Bottrill,
 Astral Cai,
 Isaac De Vlugt,
 Diksha Dhawan,
+Diego Guala,
 Korbinian Kottmann,
 Christina Lee,
 Xiaoran Li,

diff --git a/pennylane/data/__init__.py b/pennylane/data/__init__.py
@@ -133,6 +133,12 @@
 >>> my_dataset = Dataset.open("~/dataset/my_dataset/h5", mode="copy")
 >>> my_dataset.new_attribute = "abc"
 
+.. important::
+
+    Since opened datasets stream data from the disk, it is not possible to simultaneously access the same
+    dataset from separately running scripts or multiple Jupyter notebooks. To get around
+    this, either make a copy of the dataset in the disk or access the dataset using :meth:`Dataset.open()`
+    with ``mode="copy"``.
 
 Attribute Metadata
 ------------------