'How does the dmatrix in xgboost store data

i use xgboost model both in c++ and python,at first time,they give me different predicts. after i modify the code in python, i used pandas to load data,but now,i use dmatrix to load data.then,they are same.

    #data = pd.read_csv(data_path,names = features,header = None, dtype=dtypes)
    #test_x = data[features].values

    data = xgb.DMatrix(data_path)

How does the dmatrix in xgboost store data?

pythonc++xgboost


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