Only show memory usage of relatively small dataframes

Author: martinRenou

src/inspectorscripts.ts

@@ -77,9 +77,12 @@ def _jupyterlab_variableinspector_getsizeof(x):
     elif __torch and isinstance(x, __torch.Tensor):
         return x.element_size() * x.nelement()
     elif __pd and type(x).__name__ == 'DataFrame':
-        # DO NOT CALL df.memory_usage() as this can be very costly
-        # to the point of crashing the kernel
-        return "?"
+        # DO NOT CALL df.memory_usage() for big dataframes as this can be very costly
+        # to the point of making the kernel unresponsive or crashing it
+        if len(x.columns) < 10_000:
+            return x.memory_usage().sum()
+        else:
+            return "?"
     else:
         return sys.getsizeof(x)