about data_generator.py

[festla]

In RNADiffFold/datasets/data_generator.py line64~65

contact_array = np.stack(contact_list, axis=0)
data_fcn_2_array = np.stack(data_fcn_2_list, axis=0)

np.stack needs the input must have the same shape.
But the contact_list is

which is the bp pairs.

How do you process this problem?