code: def mask(df, mask_cols, seq_len):
      return callZooFunc("float", "mask", df, mask_cols, seq_len)
  
imports: from zoo.common.utils import callZooFunc
  from pyspark.sql.types import IntegerType, ShortType, LongType, FloatType, DecimalType, DoubleType
label_desc: Use image node_id 15 for calling a global function with example usage: mask(df, mask_cols, seq_len) and returns: callZooFunc