configurator should ask about gradient checkpointing interval

configure.py

@@ -543,6 +543,18 @@ def configure_env():
         )
     )
     env_contents["--gradient_checkpointing"] = "true"
+    gradient_checkpointing_interval = prompt_user(
+        "Would you like to configure a gradient checkpointing interval? A value larger than 1 will increase VRAM usage but speed up training by skipping checkpoint creation every Nth layer",
+        0,
+    )
+    try:
+        if int(gradient_checkpointing_interval) > 0:
+            env_contents["--gradient_checkpointing_interval"] = int(
+                gradient_checkpointing_interval
+            )
+    except:
+        print("Could not parse gradient checkpointing interval. Not enabling.")
+        pass
 
     env_contents["--caption_dropout_probability"] = float(
         prompt_user(