Appears in https://github.com/theislab/batchglm/blob/967e9173cec123aa33b90bec5eaf11a846ca6158/batchglm/train/tf/base/estimator_graph.py#L5 and https://github.com/theislab/batchglm/blob/2da429f895f7eb577a835da334f4ae146a9422ce/batchglm/train/tf/base/estimator.py#L15