All sequence related OP unittests should call this function to contain the case of instance size is 0.
Args:
lod (list[list of int], optional): Length-based LoD, lod[0]'s size must at least eight, lod[0] must at least two zeros at the beginning and at least two zeros at the end, the middle position of lod[0] contains a single zero and multiple zero. Default: [[0, 0, 4, 0, 3, 0, 0, 5, 0, 0]].
shape (list, optional): Shape of input, shape[0] should be equals to lod[0][0]. Default: [13, 23].
Returns:
tuple (ndarray, lod): LoD input data whose instance size is 0.
echo_line="_enable_legacy_dygraph forces the mode to old dynamic graph. You must have one RD (pangyoki (Recommend), Aurelius84 or JiabinYang) approval for the usage (either add or delete) of _enable_legacy_dygraph. For more information, please refer to: https://github.com/PaddlePaddle/Paddle/wiki/Enable-Eager-Mode-in-Paddle-CI. The corresponding lines are as follows:\n${ERROR_LINES}\n"