def create_and_check_reformer_model_with_lm_backward(
self, config, input_ids, input_mask, choice_labels):
model = ReformerModelWithLMHead(config=config)
model.to(torch_device)
model.eval()
loss = model(input_ids, attention_mask=input_mask, labels=input_ids)[0]
loss.backward()
def create_and_check_reformer_model_fp16_generate(self, config, input_ids, input_mask):
model = ReformerModelWithLMHead(config=config)
model.to(torch_device)
model.half()
model.eval()
output = model.generate(input_ids, attention_mask=input_mask, do_sample=False)
self.parent.assertFalse(torch.isnan(output).any().item())
def create_and_check_past_buckets_states(self, config, input_ids, input_mask, choice_labels):
config.is_decoder = True
config.lsh_num_chunks_before = 1
config.lsh_num_chunks_after = 0
model = ReformerModelWithLMHead(config=config)
model.to(torch_device)
model.eval()
input_ids_first = input_ids[:, :-1]
input_ids_second = input_ids[:, -1:]
# return saved cache
past_buckets_states = model(input_ids_first, use_cache=True)["past_buckets_states"]
# calculate last output with and without cache
outputs_with_cache = model(input_ids_second, past_buckets_states=past_buckets_states, use_cache=True)["logits"]
outputs_without_cache = model(input_ids)["logits"][:, -1]
# select random slice idx
random_slice_idx = torch.randint(outputs_without_cache.shape[-1], (1, 1), device=torch_device).item()
# outputs should be similar within range
self.parent.assertTrue(
torch.allclose(
outputs_with_cache[:, 0, random_slice_idx], outputs_without_cache[:, random_slice_idx], atol=1e-2
)
)
def create_and_check_reformer_with_lm(self, config, input_ids, input_mask, choice_labels):
config.lsh_num_chunks_after = 0
config.is_decoder = True
model = ReformerModelWithLMHead(config=config)
model.to(torch_device)
model.eval()
result = model(input_ids, attention_mask=input_mask, labels=input_ids)
self.parent.assertEqual(result.logits.shape, (self.batch_size, self.seq_length, self.vocab_size))
def create_and_check_reformer_feed_backward_chunking(
self, config, input_ids, input_mask, choice_labels):
if not self.is_training:
return
# disable dropout
config.hidden_dropout_prob = 0
config.local_attention_probs_dropout_prob = 0
config.lsh_attention_probs_dropout_prob = 0
torch.manual_seed(0)
model = ReformerModelWithLMHead(config=config)
model.to(torch_device)
model.train()
model.zero_grad()
loss_no_chunk, output_no_chunk = model(input_ids,
labels=input_ids,
attention_mask=input_mask)[:2]
loss_no_chunk.backward()
grad_slice_word_no_chunk = model.reformer.embeddings.word_embeddings.weight.grad[
0, :5]
grad_slice_position_factor_1_no_chunk = model.reformer.embeddings.position_embeddings.weights[
0][1, 0, -5:]
grad_slice_position_factor_2_no_chunk = model.reformer.embeddings.position_embeddings.weights[
1][0, 1, :5]
config.chunk_size_lm_head = 1
config.chunk_size_feed_forward = 1
torch.manual_seed(0)
model = ReformerModelWithLMHead(config=config)
model.to(torch_device)
model.train()
model.zero_grad()
loss_chunk, output_chunk = model(input_ids,
labels=input_ids,
attention_mask=input_mask)[:2]
loss_chunk.backward()
grad_slice_word_chunk = model.reformer.embeddings.word_embeddings.weight.grad[
0, :5]
grad_slice_position_factor_1_chunk = model.reformer.embeddings.position_embeddings.weights[
0][1, 0, -5:]
grad_slice_position_factor_2_chunk = model.reformer.embeddings.position_embeddings.weights[
1][0, 1, :5]
self.parent.assertTrue(
torch.allclose(loss_chunk, loss_no_chunk, atol=1e-3))
self.parent.assertTrue(
torch.allclose(grad_slice_word_no_chunk,
grad_slice_word_chunk,
atol=1e-3))
self.parent.assertTrue(
torch.allclose(grad_slice_position_factor_1_chunk,
grad_slice_position_factor_1_no_chunk,
atol=1e-3))
self.parent.assertTrue(
torch.allclose(grad_slice_position_factor_2_chunk,
grad_slice_position_factor_2_no_chunk,
atol=1e-3))
def create_and_check_reformer_no_chunking(self, config, input_ids, input_mask, choice_labels):
# force chunk length to be bigger than input_ids
config.lsh_attn_chunk_length = 2 * input_ids.shape[-1]
config.local_attn_chunk_length = 2 * input_ids.shape[-1]
model = ReformerModelWithLMHead(config=config)
model.to(torch_device)
model.eval()
output_logits = model(input_ids, attention_mask=input_mask)[0]
self.parent.assertTrue(output_logits.shape[1] == input_ids.shape[-1])
def create_and_check_reformer_model_fp16_generate(self, config, input_ids, input_mask, choice_labels):
config.is_decoder = True
config.lsh_num_chunks_after = 0
model = ReformerModelWithLMHead(config=config)
model.to(torch_device)
model.half()
model.eval()
# only use last 10 inputs for generation
output = model.generate(input_ids[:, -10:], attention_mask=input_mask, do_sample=False)
self.parent.assertFalse(torch.isnan(output).any().item())
def create_and_check_reformer_model_generate(self, config, input_ids, input_mask, choice_labels):
config.is_decoder = True
config.lsh_num_chunks_after = 0
config.bos_token_id = 0
config.eos_token_id = None
config.max_length = 20
model = ReformerModelWithLMHead(config=config)
model.to(torch_device)
model.eval()
output = model.generate()
self.parent.assertIsNotNone(output)
def create_and_check_reformer_with_lm(self, config, input_ids, input_mask, choice_labels):
model = ReformerModelWithLMHead(config=config)
model.to(torch_device)
model.eval()
loss, prediction_scores = model(input_ids, attention_mask=input_mask, labels=input_ids)
result = {
"loss": loss,
"prediction_scores": prediction_scores,
}
self.parent.assertListEqual(
list(result["prediction_scores"].size()), [self.batch_size, self.seq_length, self.vocab_size],
)
self.check_loss_output(result)
