xgboostにDMatrixが存在しないと言われる

import xgboost as xgb
xgb.DMatrix(data)

raceback (most recent call last):
  File "xgboost.py", line 19, in <module>
    import xgboost as xgb
  File "/opt/kaggle/titanic/xgboost.py", line 26, in <module>
    print(xgb.DMatrix)
AttributeError: module 'xgboost' has no attribute 'DMatrix'