Move memorystatus class inside, more comments

- Moving inside since it is used only for that function

src/tabpfn/utils.py

@@ -790,20 +790,7 @@ def _transform_borders_one(
     return logit_cancel_mask, descending_borders, borders_t
 
 
-# ref: https://github.com/microsoft/windows-rs/blob/c9177f7a65c764c237a9aebbd3803de683bedaab/crates/tests/bindgen/src/fn_return_void_sys.rs#L12
-# ref: https://learn.microsoft.com/en-us/windows/win32/api/sysinfoapi/ns-sysinfoapi-memorystatusex
-class _MEMORYSTATUSEX(ctypes.Structure):
-    _fields_: typing.ClassVar = [
-        ("dwLength", ctypes.c_ulong),
-        ("dwMemoryLoad", ctypes.c_ulong),
-        ("ullTotalPhys", ctypes.c_ulonglong),
-        ("ullAvailPhys", ctypes.c_ulonglong),
-        ("ullTotalPageFile", ctypes.c_ulonglong),
-        ("ullAvailPageFile", ctypes.c_ulonglong),
-        ("ullTotalVirtual", ctypes.c_ulonglong),
-        ("ullAvailVirtual", ctypes.c_ulonglong),
-        ("ullAvailExtendedVirtual", ctypes.c_ulonglong),
-    ]
+
 
 
 # Terminology: Use memory to referent physical memory, swap for swap memory
@@ -813,6 +800,22 @@ def get_total_memory_windows() -> float:
     Returns:
         The total memory of the system in GB.
     """
+    # ref: https://github.com/microsoft/windows-rs/blob/c9177f7a65c764c237a9aebbd3803de683bedaab/crates/tests/bindgen/src/fn_return_void_sys.rs#L12
+    # ref: https://learn.microsoft.com/en-us/windows/win32/api/sysinfoapi/ns-sysinfoapi-memorystatusex
+    # this class is needed to load the memory status with GlobalMemoryStatusEx function using win32 API,
+    # for more details see microsoft docs link above
+    class _MEMORYSTATUSEX(ctypes.Structure):
+        _fields_: typing.ClassVar = [
+            ("dwLength", ctypes.c_ulong),
+            ("dwMemoryLoad", ctypes.c_ulong),
+            ("ullTotalPhys", ctypes.c_ulonglong),
+            ("ullAvailPhys", ctypes.c_ulonglong),
+            ("ullTotalPageFile", ctypes.c_ulonglong),
+            ("ullAvailPageFile", ctypes.c_ulonglong),
+            ("ullTotalVirtual", ctypes.c_ulonglong),
+            ("ullAvailVirtual", ctypes.c_ulonglong),
+            ("ullAvailExtendedVirtual", ctypes.c_ulonglong),
+        ]
     # Initialize the structure
     mem_status = _MEMORYSTATUSEX()
     # need to initialize lenght of structure, see microsft docs above