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training_args = TrainingArguments(
    output_dir='pegasus-base-wikilarge-newsela-with-domain-adaptation',
    num_train_epochs=20,
    warmup_steps=250,
    per_device_train_batch_size=BATCH_SIZE,
    weight_decay=0.01,
    learning_rate=2e-4,
    # fp16=True,
    optim="adafactor",
)

Step	Training Loss
500	4.391800
1000	3.994400
1500	3.009300
2000	2.596300
2500	2.389600
3000	2.328100
3500	2.272900
4000	2.125300
4500	2.019500
5000	2.005500
5500	1.994400
6000	1.853300
6500	1.838700
7000	1.840200
7500	1.822700
8000	1.716600
8500	1.734100
9000	1.739500
9500	1.696000
10000	1.661700
10500	1.672500
11000	1.666800
11500	1.617700
12000	1.611400
12500	1.616300
13000	1.625800
13500	1.567700
14000	1.584600
14500	1.589800
15000	1.574600
15500	1.548300
16000	1.559800
16500	1.562100
17000	1.541600
17500	1.533500
18000	1.538400
18500	1.545700
19000	1.510100
19500	1.522600
20000	1.529100
20500	1.520900
21000	1.501100
21500	1.508400
22000	1.515400
22500	1.500100
23000	1.496700
23500	1.495900
24000	1.505200
24500	1.484400
25000	1.483000
25500	1.491200
26000	1.491900
26500	1.468600
27000	1.479800
27500	1.479600
28000	1.474400
28500	1.466000
29000	1.471700
29500	1.473100
30000	1.463900
30500	1.459300
31000	1.463200
31500	1.466800
32000	1.455300
32500	1.458600
33000	1.455200
33500	1.455500
34000	1.449100
34500	1.451400
35000	1.451200
35500	1.449000
36000	1.443700
36500	1.447600
37000	1.447300
TrainOutput(global_step=37100, training_loss=1.7110925547967382, metrics={'train_runtime': 33376.534, 'train_samples_per_second': 8.889, 'train_steps_per_second': 1.112, 'total_flos': 0.0, 'train_loss': 1.7110925547967382, 'epoch': 20.0})