code: def compute(df):
      return callZooFunc("float", "compute", df)
  
imports: from zoo.common.utils import callZooFunc
  from pyspark.sql.types import IntegerType, ShortType, LongType, FloatType, DecimalType, DoubleType
label_desc: Use image node_id 1 for calling a global function with example usage: compute(df) and returns: callZooFunc