Can you explain why stride[::3] has to be [1, 1]?

[YuqiData-UW]

nn-Meter/nn_meter/ir_converter/frozenpb_converter/shape_inference.py

Line 272 in bd6bcb2

if node["attr"]["attr"]["strides"][::3] != [1, 1]:

I got some models doesn't fit this rule. If I ignore it, what's the consequence