import tensorflow as tf

            tf.placeholder(tf.float32, [None, 4]),
        fields.InputDataFields.groundtruth_classes:
            tf.placeholder(tf.int32, [None, 3]),
        fields.InputDataFields.num_groundtruth_boxes:
            tf.placeholder(tf.int32, [])
    }
    padded_tensor_dict = inputs.pad_input_data_to_static_shapes(
        tensor_dict=input_tensor_dict,
