+class ProblemTwoTargets(Problem):
+ def __init__(self, len_total=10, len_target=2):
+ assert len_total >= 3 * (2 + len_target) - 1
+ self.len_total = len_total
+ self.len_target = len_target
+
+ def generate_sequences(self, nb):
+ k = torch.arange(self.len_total)[None, :]
+ l = torch.randint(self.len_total, (2, nb))[:, :, None] + 1
+ i = torch.randint(10, (2, nb))[:, :, None]
+ a = l[0]
+ b = l[0] + 1 + l[1]
+ c = l[0] + 1 + l[1] + 1 + l[0]
+ sequences = (
+ (k < a) * i[0]
+ + (k == a) * 10
+ + (k > a) * (k < b) * i[1]
+ + (k == b) * 11
+ + (k > b) * (k < c) * i[1]
+ + (k >= c) * 12
+ )
+ ar_mask = (sequences == 11).long()
+ ar_mask = (ar_mask.cumsum(1) - ar_mask).clamp(max=1)
+ return sequences, ar_mask
+
+ def seq2str(self, seq):
+ return "".join("0123456789|>_"[x.item()] for x in seq)
+
+
+####################
+
+