class_docstr: CSV format benchmark writer.
  
  It writes benchmark statistics taken by :class:`FunctionBenchmark`
  in CSV file format.
  
  Args:
      file (Python file object): The benchmark will be written to the file.
class_docstr_tok: ["CSV","format","benchmark","writer",".","It","writes","benchmark","statistics","taken","by",":","class",":","`","FunctionBenchmark","`","in","CSV","file","format",".","Args",":","file","(","Python","file","object",")",":","The","benchmark","will","be","written","to","the","file","."]
code: def __init__(self, file=sys.stdout):
      self.file = file
      self.write_header()
  
imports: from __future__ import print_function
  import nnabla
  import nnabla.initializer
  import sys
  import importlib
  import time
  from collections import namedtuple
  import csv
label_desc: Use image node_id 1 to create a new FunctionBenchmarkCsvWriter object from inherited base classes: FunctionBenchmarkWriter with example: obj = FunctionBenchmarkCsvWriter(file)