from torch.nn.functional import * from torch.nn.functional import ( _mha_shape_check, _canonical_mask, _none_or_dtype, _in_projection_packed, ) # import torch # Tensor = torch.Tensor # from typing import Callable, List, Optional, Tuple, Union def multi_head_attention_forward_patched( query: Tensor, key: Tensor, value: Tensor, embed_dim_to_check: int, num_heads: int, in_proj_weight: Optional[Tensor], in_proj_bias: Optional[Tensor], bias_k: Optional[Tensor], bias_v: Optional[Tensor], add_zero_attn: bool, dropout_p: float, out_proj_weight: Tensor, out_proj_bias: Optional[Tensor], training: bool = True, key_padding_mask: Optional[Tensor] = None, need_weights: bool = True, attn_mask: Optional[Tensor] = None, use_separate_proj_weight: bool = False, q_proj_weight: Optional[Tensor] = None, k_proj_weight: Optional[Tensor] = None, v_proj_weight: Optional[Tensor] = None, static_k: Optional[Tensor] = None, static_v: Optional[Tensor] = None, average_attn_weights: bool = True, is_causal: bool = False, cache=None, ) -> Tuple[Tensor, Optional[Tensor]]: r""" Args: query, key, value: map a query and a set of key-value pairs to an output. See "Attention Is All You Need" for more details. embed_dim_to_check: total dimension of the model. num_heads: parallel attention heads. in_proj_weight, in_proj_bias: input projection weight and bias. bias_k, bias_v: bias of the key and value sequences to be added at dim=0. add_zero_attn: add a new batch of zeros to the key and value sequences at dim=1. dropout_p: probability of an element to be zeroed. out_proj_weight, out_proj_bias: the output projection weight and bias. training: apply dropout if is ``True``. key_padding_mask: if provided, specified padding elements in the key will be ignored by the attention. This is an binary mask. When the value is True, the corresponding value on the attention layer will be filled with -inf. need_weights: output attn_output_weights. Default: `True` Note: `needs_weight` defaults to `True`, but should be set to `False` For best performance when attention weights are not nedeeded. *Setting needs_weights to `True` leads to a significant performance degradation.* attn_mask: 2D or 3D mask that prevents attention to certain positions. A 2D mask will be broadcasted for all the batches while a 3D mask allows to specify a different mask for the entries of each batch. is_causal: If specified, applies a causal mask as attention mask, and ignores attn_mask for computing scaled dot product attention. Default: ``False``. .. warning:: is_causal is provides a hint that the attn_mask is the causal mask.Providing incorrect hints can result in incorrect execution, including forward and backward compatibility. use_separate_proj_weight: the function accept the proj. weights for query, key, and value in different forms. If false, in_proj_weight will be used, which is a combination of q_proj_weight, k_proj_weight, v_proj_weight. q_proj_weight, k_proj_weight, v_proj_weight, in_proj_bias: input projection weight and bias. static_k, static_v: static key and value used for attention operators. average_attn_weights: If true, indicates that the returned ``attn_weights`` should be averaged across heads. Otherwise, ``attn_weights`` are provided separately per head. Note that this flag only has an effect when ``need_weights=True.``. Default: True Shape: Inputs: - query: :math:`(L, E)` or :math:`(L, N, E)` where L is the target sequence length, N is the batch size, E is the embedding dimension. - key: :math:`(S, E)` or :math:`(S, N, E)`, where S is the source sequence length, N is the batch size, E is the embedding dimension. - value: :math:`(S, E)` or :math:`(S, N, E)` where S is the source sequence length, N is the batch size, E is the embedding dimension. - key_padding_mask: :math:`(S)` or :math:`(N, S)` where N is the batch size, S is the source sequence length. If a FloatTensor is provided, it will be directly added to the value. If a BoolTensor is provided, the positions with the value of ``True`` will be ignored while the position with the value of ``False`` will be unchanged. - attn_mask: 2D mask :math:`(L, S)` where L is the target sequence length, S is the source sequence length. 3D mask :math:`(N*num_heads, L, S)` where N is the batch size, L is the target sequence length, S is the source sequence length. attn_mask ensures that position i is allowed to attend the unmasked positions. If a BoolTensor is provided, positions with ``True`` are not allowed to attend while ``False`` values will be unchanged. If a FloatTensor is provided, it will be added to the attention weight. - static_k: :math:`(N*num_heads, S, E/num_heads)`, where S is the source sequence length, N is the batch size, E is the embedding dimension. E/num_heads is the head dimension. - static_v: :math:`(N*num_heads, S, E/num_heads)`, where S is the source sequence length, N is the batch size, E is the embedding dimension. E/num_heads is the head dimension. Outputs: - attn_output: :math:`(L, E)` or :math:`(L, N, E)` where L is the target sequence length, N is the batch size, E is the embedding dimension. - attn_output_weights: Only returned when ``need_weights=True``. If ``average_attn_weights=True``, returns attention weights averaged across heads of shape :math:`(L, S)` when input is unbatched or :math:`(N, L, S)`, where :math:`N` is the batch size, :math:`L` is the target sequence length, and :math:`S` is the source sequence length. If ``average_attn_weights=False``, returns attention weights per head of shape :math:`(num_heads, L, S)` when input is unbatched or :math:`(N, num_heads, L, S)`. """ tens_ops = ( query, key, value, in_proj_weight, in_proj_bias, bias_k, bias_v, out_proj_weight, out_proj_bias, ) if has_torch_function(tens_ops): return handle_torch_function( multi_head_attention_forward, tens_ops, query, key, value, embed_dim_to_check, num_heads, in_proj_weight, in_proj_bias, bias_k, bias_v, add_zero_attn, dropout_p, out_proj_weight, out_proj_bias, training=training, key_padding_mask=key_padding_mask, need_weights=need_weights, attn_mask=attn_mask, is_causal=is_causal, use_separate_proj_weight=use_separate_proj_weight, q_proj_weight=q_proj_weight, k_proj_weight=k_proj_weight, v_proj_weight=v_proj_weight, static_k=static_k, static_v=static_v, average_attn_weights=average_attn_weights, cache=cache, ) is_batched = _mha_shape_check( query, key, value, key_padding_mask, attn_mask, num_heads ) # For unbatched input, we unsqueeze at the expected batch-dim to pretend that the input # is batched, run the computation and before returning squeeze the # batch dimension so that the output doesn't carry this temporary batch dimension. if not is_batched: # unsqueeze if the input is unbatched query = query.unsqueeze(1) key = key.unsqueeze(1) value = value.unsqueeze(1) if key_padding_mask is not None: key_padding_mask = key_padding_mask.unsqueeze(0) # set up shape vars tgt_len, bsz, embed_dim = query.shape src_len, _, _ = key.shape key_padding_mask = _canonical_mask( mask=key_padding_mask, mask_name="key_padding_mask", other_type=_none_or_dtype(attn_mask), other_name="attn_mask", target_type=query.dtype, ) if is_causal and attn_mask is None: raise RuntimeError( "Need attn_mask if specifying the is_causal hint. " "You may use the Transformer module method " "`generate_square_subsequent_mask` to create this mask." ) if is_causal and key_padding_mask is None and not need_weights: # when we have a kpm or need weights, we need attn_mask # Otherwise, we use the is_causal hint go as is_causal # indicator to SDPA. attn_mask = None else: attn_mask = _canonical_mask( mask=attn_mask, mask_name="attn_mask", other_type=None, other_name="", target_type=query.dtype, check_other=False, ) if key_padding_mask is not None: # We have the attn_mask, and use that to merge kpm into it. # Turn off use of is_causal hint, as the merged mask is no # longer causal. is_causal = False assert ( embed_dim == embed_dim_to_check ), f"was expecting embedding dimension of {embed_dim_to_check}, but got {embed_dim}" if isinstance(embed_dim, torch.Tensor): # embed_dim can be a tensor when JIT tracing head_dim = embed_dim.div(num_heads, rounding_mode="trunc") else: head_dim = embed_dim // num_heads assert ( head_dim * num_heads == embed_dim ), f"embed_dim {embed_dim} not divisible by num_heads {num_heads}" if use_separate_proj_weight: # allow MHA to have different embedding dimensions when separate projection weights are used assert ( key.shape[:2] == value.shape[:2] ), f"key's sequence and batch dims {key.shape[:2]} do not match value's {value.shape[:2]}" else: assert ( key.shape == value.shape ), f"key shape {key.shape} does not match value shape {value.shape}" # # compute in-projection # if not use_separate_proj_weight: assert ( in_proj_weight is not None ), "use_separate_proj_weight is False but in_proj_weight is None" q, k, v = _in_projection_packed(query, key, value, in_proj_weight, in_proj_bias) else: assert ( q_proj_weight is not None ), "use_separate_proj_weight is True but q_proj_weight is None" assert ( k_proj_weight is not None ), "use_separate_proj_weight is True but k_proj_weight is None" assert ( v_proj_weight is not None ), "use_separate_proj_weight is True but v_proj_weight is None" if in_proj_bias is None: b_q = b_k = b_v = None else: b_q, b_k, b_v = in_proj_bias.chunk(3) q, k, v = _in_projection( query, key, value, q_proj_weight, k_proj_weight, v_proj_weight, b_q, b_k, b_v, ) if cache != None: if cache["first_infer"] == 1: cache["k"][cache["stage"]] = k # print(0,cache["k"].shape) cache["v"][cache["stage"]] = v else: ###12个layer每个都要留自己的cache_kv # print(1,cache["k"].shape) cache["k"][cache["stage"]] = torch.cat( [cache["k"][cache["stage"]], k], 0 ) ##本来时序是1，但是proj的时候可能transpose了所以时序到0维了 cache["v"][cache["stage"]] = torch.cat([cache["v"][cache["stage"]], v], 0) # print(2, cache["k"].shape) src_len = cache["k"][cache["stage"]].shape[0] k = cache["k"][cache["stage"]] v = cache["v"][cache["stage"]] # if attn_mask is not None: # attn_mask=attn_mask[-1:,] # print(attn_mask.shape,attn_mask) cache["stage"] = (cache["stage"] + 1) % cache["all_stage"] # print(2333,cache) # prep attention mask attn_mask = _canonical_mask( mask=attn_mask, mask_name="attn_mask", other_type=None, other_name="", target_type=q.dtype, check_other=False, ) if attn_mask is not None: # ensure attn_mask's dim is 3 if attn_mask.dim() == 2: correct_2d_size = (tgt_len, src_len) if attn_mask.shape != correct_2d_size: raise RuntimeError( f"The shape of the 2D attn_mask is {attn_mask.shape}, but should be {correct_2d_size}." ) attn_mask = attn_mask.unsqueeze(0) elif attn_mask.dim() == 3: correct_3d_size = (bsz * num_heads, tgt_len, src_len) if attn_mask.shape != correct_3d_size: raise RuntimeError( f"The shape of the 3D attn_mask is {attn_mask.shape}, but should be {correct_3d_size}." ) else: raise RuntimeError( f"attn_mask's dimension {attn_mask.dim()} is not supported" ) # add bias along batch dimension (currently second) if bias_k is not None and bias_v is not None: assert static_k is None, "bias cannot be added to static key." assert static_v is None, "bias cannot be added to static value." k = torch.cat([k, bias_k.repeat(1, bsz, 1)]) v = torch.cat([v, bias_v.repeat(1, bsz, 1)]) if attn_mask is not None: attn_mask = pad(attn_mask, (0, 1)) if key_padding_mask is not None: key_padding_mask = pad(key_padding_mask, (0, 1)) else: assert bias_k is None assert bias_v is None # # reshape q, k, v for multihead attention and make em batch first # q = q.view(tgt_len, bsz * num_heads, head_dim).transpose(0, 1) if static_k is None: k = k.view(k.shape[0], bsz * num_heads, head_dim).transpose(0, 1) else: # TODO finish disentangling control flow so we don't do in-projections when statics are passed assert ( static_k.size(0) == bsz * num_heads ), f"expecting static_k.size(0) of {bsz * num_heads}, but got {static_k.size(0)}" assert ( static_k.size(2) == head_dim ), f"expecting static_k.size(2) of {head_dim}, but got {static_k.size(2)}" k = static_k if static_v is None: v = v.view(v.shape[0], bsz * num_heads, head_dim).transpose(0, 1) else: # TODO finish disentangling control flow so we don't do in-projections when statics are passed assert ( static_v.size(0) == bsz * num_heads ), f"expecting static_v.size(0) of {bsz * num_heads}, but got {static_v.size(0)}" assert ( static_v.size(2) == head_dim ), f"expecting static_v.size(2) of {head_dim}, but got {static_v.size(2)}" v = static_v # add zero attention along batch dimension (now first) if add_zero_attn: zero_attn_shape = (bsz * num_heads, 1, head_dim) k = torch.cat( [k, torch.zeros(zero_attn_shape, dtype=k.dtype, device=k.device)], dim=1 ) v = torch.cat( [v, torch.zeros(zero_attn_shape, dtype=v.dtype, device=v.device)], dim=1 ) if attn_mask is not None: attn_mask = pad(attn_mask, (0, 1)) if key_padding_mask is not None: key_padding_mask = pad(key_padding_mask, (0, 1)) # update source sequence length after adjustments src_len = k.size(1) # merge key padding and attention masks if key_padding_mask is not None: assert key_padding_mask.shape == ( bsz, src_len, ), f"expecting key_padding_mask shape of {(bsz, src_len)}, but got {key_padding_mask.shape}" key_padding_mask = ( key_padding_mask.view(bsz, 1, 1, src_len) .expand(-1, num_heads, -1, -1) .reshape(bsz * num_heads, 1, src_len) ) if attn_mask is None: attn_mask = key_padding_mask else: attn_mask = attn_mask + key_padding_mask # adjust dropout probability if not training: dropout_p = 0.0 # # (deep breath) calculate attention and out projection # if need_weights: B, Nt, E = q.shape q_scaled = q / math.sqrt(E) assert not ( is_causal and attn_mask is None ), "FIXME: is_causal not implemented for need_weights" if attn_mask is not None: attn_output_weights = torch.baddbmm( attn_mask, q_scaled, k.transpose(-2, -1) ) else: attn_output_weights = torch.bmm(q_scaled, k.transpose(-2, -1)) attn_output_weights = softmax(attn_output_weights, dim=-1) if dropout_p > 0.0: attn_output_weights = dropout(attn_output_weights, p=dropout_p) attn_output = torch.bmm(attn_output_weights, v) attn_output = ( attn_output.transpose(0, 1).contiguous().view(tgt_len * bsz, embed_dim) ) attn_output = linear(attn_output, out_proj_weight, out_proj_bias) attn_output = attn_output.view(tgt_len, bsz, attn_output.size(1)) # optionally average attention weights over heads attn_output_weights = attn_output_weights.view(bsz, num_heads, tgt_len, src_len) if average_attn_weights: attn_output_weights = attn_output_weights.mean(dim=1) if not is_batched: # squeeze the output if input was unbatched attn_output = attn_output.squeeze(1) attn_output_weights = attn_output_weights.squeeze(0) return attn_output, attn_output_weights else: # attn_mask can be either (L,S) or (N*num_heads, L, S) # if attn_mask's shape is (1, L, S) we need to unsqueeze to (1, 1, L, S) # in order to match the input for SDPA of (N, num_heads, L, S) if attn_mask is not None: if attn_mask.size(0) == 1 and attn_mask.dim() == 3: attn_mask = attn_mask.unsqueeze(0) else: attn_mask = attn_mask.view(bsz, num_heads, -1, src_len) q = q.view(bsz, num_heads, tgt_len, head_dim) k = k.view(bsz, num_heads, src_len, head_dim) v = v.view(bsz, num_heads, src_len, head_dim) attn_output = scaled_dot_product_attention( q, k, v, attn_mask, dropout_p, is_causal ) attn_output = ( attn_output.permute(2, 0, 1, 3).contiguous().view(bsz * tgt_len, embed_dim) ) attn_output = linear(attn_output, out_proj_weight, out_proj_bias) attn_output = attn_output.view(tgt_len, bsz, attn_output.size(1)) if not is_batched: # squeeze the output if input was unbatched attn_output = attn_output.squeeze(1) return attn_output, None