code: def _get_input(graph):
      ph_names = []
      for n in graph.as_graph_def().node:
          # Just the input nodes:
          if n.op == "Placeholder":
              ph_names.append(n.name)
      return ph_names
  
imports: import tensorflow
  import numpy
  import logging
  import tempfile
  import pandas
  from pyspark import RDD, SparkContext
  from pyspark.sql import SQLContext, Row, DataFrame
  from pyspark.sql.types import DoubleType, IntegerType, LongType, FloatType, ArrayType
label_desc: Use image node_id 11 for calling a global function with example usage: _get_input(graph) and returns: ph_names