def read_data(file_name):
 '''
 file_name:文件地址
 '''
 inputfile = open(file_name, 'rb') #可打开含有中文的地址
 data = pd.read_csv(inputfile, iterator=True)
 loop = True
 chunkSize = 1000 #一千行一块
 chunks = []
 while loop:
  try:
   chunk = dcs.get_chunk(chunkSize)
   chunks.append(chunk)
  except StopIteration:
   loop = False
   print("Iteration is stopped.")
 data = pd.concat(chunks, ignore_index=True)
 #print(train.head())
 return data