code: def execute(self, ctx):
      ctx.dataset.delete_sample_field(
          ctx.params.get("field_name", None)
      )
      ctx.trigger("reload_dataset")
  
imports: import os
  import fiftyone
  import fiftyone.core.storage
  import fiftyone.operators
  import fiftyone.operators.types
label_desc: Use image node_id 3 for calling the DeleteSampleField obj's underlying member method code with example usage: obj.execute(ctx) without return types