code: def validate_module(self, pipeline):
      images = set()
      if len(self.images_list.value) == 0:
          raise ValidationError("No images selected", self.images_list)
      for image_name in self.images_list.value:
          if image_name in images:
              raise ValidationError(
                  "%s has already been selected" % image_name,
                  image_name,
              )
          images.add(image_name)
  
      objects = set()
      for group in self.objects:
          if group.object_name.value in objects:
              raise ValidationError(
                  "{} has already been selected".format(
                      group.object_name.value
                  ),
                  group.object_name,
              )
          objects.add(group.object_name.value)
  
      bins = set()
      for group in self.bin_counts:
          if group.bin_count.value in bins:
              raise ValidationError(
                  "{} has already been selected".format(
                      group.bin_count.value
                  ),
                  group.bin_count,
              )
          bins.add(group.bin_count.value)
  
imports: import centrosome.cpmorphology
  import centrosome.propagate
  import centrosome.zernike
  import matplotlib.cm
  import numpy
  import numpy.ma
  import scipy.ndimage
  import scipy.sparse
  from cellprofiler_core.constants.measurement import COLTYPE_FLOAT
  from cellprofiler_core.image import Image
  from cellprofiler_core.module import Module
  from cellprofiler_core.preferences import get_default_colormap
  from cellprofiler_core.setting import HiddenCount, Divider, SettingsGroup, Binary, ValidationError
  from cellprofiler_core.setting.choice import Choice, Colormap
  from cellprofiler_core.setting.do_something import DoSomething, RemoveSettingButton
  from cellprofiler_core.setting.subscriber import LabelSubscriber, ImageListSubscriber, ImageSubscriber
  from cellprofiler_core.setting.text import Integer, ImageName
  from cellprofiler_core.utilities.core.object import crop_labels_and_image, size_similarly
  import cellprofiler.gui.help.content
label_desc: Use image node_id 6 for calling the MeasureObjectIntensityDistribution obj's underlying member method code with example usage: obj.validate_module(pipeline) without return types