Fixing issue with autoloading of ipython extension

src/benchq/compilation/graph_states/initialize_julia.py

@@ -1,3 +1,4 @@
+import os
 from typing import Any
 
 import juliapkg
@@ -52,6 +53,13 @@
 
 juliapkg.resolve()
 
+# Disable autoloading of the IPython extension unless the user explicitly requests it.
+# Context: if IPython.display.set_matplotlib_formats has been called, then the
+# autoloading of the IPython extension seems to cause the program to exit or hang. (The
+# set_matplotlib_formats function gets called, for example, when certain pyLIQTR modules
+#  are imported.)
+if "PYTHON_JULIACALL_AUTOLOAD_IPYTHON_EXTENSION" not in os.environ:
+    os.environ["PYTHON_JULIACALL_AUTOLOAD_IPYTHON_EXTENSION"] = "no"
 
 # Put this import second because it can install julia automatically and we don't
 # want to install julia twice if the julia version that juliacall finds is different