code: def seq_int_arr(seqs):
      
      return np.array([[NT_TO_INT[c] for c in x.upper()] for x in seqs])
docs: Convert list of ACGT strings to matix of 1-4 ints
  
      Args:
          seqs (list of str): nucleotide sequences with only 'ACGT' characters
  
      Returns:
          numpy.array of int: matrix of integers from 1 to 4 inclusive representing A, C, G, and T
          str: nucleotide sequence string