code: def remove_UV_negative_entries(dataset):
      """Remove negative entries from UV dataset.
  
      Negative entries are malformed for UV dataset. Remove them.
      """
      for i, (X, y, w, ids) in enumerate(dataset.itershards()):
          malformed = np.where(y <= 0)
          y[malformed] = 0
          w[malformed] = 0
          dataset.set_shard(i, X, y, w, ids)
  
file_path: deepchem/examples/uv/UV_datasets.py
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import unicode_literals
  import os
  import shutil
  import time
  import numpy
  import deepchem
  from uv_features import uv_descriptors
label_desc: Use image node_id 3 for calling a global function with example usage: remove_UV_negative_entries(dataset) without return types