def build()

in src/preprocess.py [0:0]


    def build(self):
        self._logger.info("Loading data from data manifest %s", self._data_manifest)
        data_paths = self._data_manifest.get("data")

        df_array = []
        for index, value in enumerate(data_paths):
            df = self._download_file(index, value["bucketName"], value["objectKey"])
            df_array.append(df)

        if len(df_array):
            return pd.concat(df_array)