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@ -26,29 +26,29 @@ class TransformerBackend(ModuleBackend):
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self.inference_pool = TaskPool(self.inference_step, max_batch_size=1, name=f"{self.name}_inference")
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def inference_step(self, cache_metadata: torch.IntTensor, *inputs: torch.Tensor) -> Tuple[torch.Tensor, ...]:
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attention_cache_handle = int(cache_metadata[0, 0].item())
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prefix_length = int(cache_metadata[0, 1].item())
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hidden_states = inputs[0] # todo: in future, it would be best to support attention mask here
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assert hidden_states.ndim == 3, "expected hidden states to be 3-dimensional: [batch_size, seq_len, hid_size]"
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with self.memory_cache.use_cache(attention_cache_handle) as cache:
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print("METADATA:", cache_metadata)
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assert isinstance(self.module, BloomBlock) and cache.shape[0] == 2 and cache.ndim == 5
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layer_past = past_k, past_v = cache[0, :, :prefix_length], cache[1, :, :prefix_length]
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print("PAST", past_k.shape, past_v.shape)
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hidden_states, (new_k, new_v) = self.module.forward(hidden_states, layer_past=layer_past, use_cache=True)
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# todo remove these asserts once we pass all tests
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new_length = new_v.shape[1]
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assert new_length > prefix_length
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assert new_k.shape[0] == past_k.shape[0] and new_v.shape[0] == past_v.shape[0]
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assert new_k.shape[1] == new_length and new_v.shape[1] == new_length
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assert new_k.shape[2:] == past_k.shape[2:] and new_v.shape[2:] == past_v.shape[2:]
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assert torch.allclose(new_v[:, : past_v.shape[1]], past_v)
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assert torch.allclose(new_k[:, : past_k.shape[1]], past_k)
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cache[0, :, prefix_length:new_length, :] = new_k[:, prefix_length:new_length]
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cache[1, :, prefix_length:new_length, :] = new_v[:, prefix_length:new_length]
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return (hidden_states,)
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with torch.inference_mode():
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attention_cache_handle = int(cache_metadata[0, 0].item())
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prefix_length = int(cache_metadata[0, 1].item())
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hidden_states = inputs[0] # todo: in future, it would be best to support attention mask here
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assert hidden_states.ndim == 3, "expected hidden states to be 3-dimensional: [batch_size, seq_len, hid_size]"
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with self.memory_cache.use_cache(attention_cache_handle) as cache:
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assert isinstance(self.module, BloomBlock) and cache.shape[0] == 2 and cache.ndim == 5
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layer_past = past_k, past_v = cache[0, :, :prefix_length], cache[1, :, :prefix_length]
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print("METADATA:", cache_metadata, past_k.shape, past_v.shape)
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hidden_states, (new_k, new_v) = self.module.forward(hidden_states, layer_past=layer_past, use_cache=True)
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# todo remove these asserts once we pass all tests
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new_length = new_v.shape[1]
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assert new_length > prefix_length
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assert new_k.shape[0] == past_k.shape[0] and new_v.shape[0] == past_v.shape[0]
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assert new_k.shape[1] == new_length and new_v.shape[1] == new_length
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assert new_k.shape[2:] == past_k.shape[2:] and new_v.shape[2:] == past_v.shape[2:]
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assert torch.allclose(new_v[:, : past_v.shape[1]], past_v)
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assert torch.allclose(new_k[:, : past_k.shape[1]], past_k)
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cache[0, :, prefix_length:new_length, :] = new_k[:, prefix_length:new_length]
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cache[1, :, prefix_length:new_length, :] = new_v[:, prefix_length:new_length]
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return (hidden_states,)
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def get_pools(self) -> Sequence[TaskPool]:
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return self.forward_pool, self.backward_pool, self.inference_pool
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