Repository: pytorch
Issue: when convert to onnx with dynamix_axis,  the Reshape op  value is always the same as static,  dynamic_axis is useless, it cant't inference right shape dynamically
Labels: module: onnx,triaged

### 🐛 Describe the bug

![Screenshot 2023-04-20 at 16-17-53 onnx](https://user-images.githubusercontent.com/32585434/233304748-e8b05678-c59c-4406-9f18-32047aa4321b.png)
### 🐛 Describe the bug

when convert to onnx with dynamix_axis,  the Reshape op  value is always the same as static,  dynamic_axis is useless, it cant't inference right shape dynamically

the graph is part of transfomers, in Fig , Thre Reshape value is always unchanged, is  obtained by dummpy_input when using totch.onnx.export, after i convert to onnx ,and infer with another size Input ,  raise an error:

 Non-zero status code returned while running Reshape node. Name:'Reshape_375' Status Message: /onnxruntime_src/onnxruntime/core/providers/cpu/tensor/reshape_helper.h:41 onnxruntime::ReshapeHelper::ReshapeHelper(const onnxruntime::TensorShape&, onnxruntime::TensorShapeVector&, bool) gsl::narrow_cast<int64_t>(input_shape.Size()) == size was false. The input tensor cannot be reshaped to the requested shape. Input shape:{12,7,512}, requested shape:{18,36,128}

the shape {18,36,128} is obtained by torch.onnx.export , this shape unchanged , it results to error when i try to another Input, actually, i use dynamic_axis flags . i doubt   q = q.contiguous().view(tgt_len, bsz * num_heads, head_dim).transpose(0, 1)  shape is not right，here 
   tgt_len, bsz, embed_dim = query.shape  is get the shape.

but its value is infered by dummpy_input  shape by totch.onnx.export,  the model only remember {18,36,128},not dynamic size, when infer with shape {12,7,512},  raise error:
  q = q.contiguous().view(tgt_len, bsz * num_heads, head_dim).transpose(0, 1) this code can't get dynamic shape


what is the reason that results to errors??? it is very strange , i have no ideas to solve it???



the code to the graph is as follows:



                      def multi_head_attention_forward(
                          query: Tensor,
                          key: Tensor,
                          value: Tensor,
                          embed_dim_to_check: int,
                          num_heads: int,
                          in_proj_weight: 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,
                      ) -> 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.
                              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.
                              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.
                      
                      
                      
                          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,
                                  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,
                              )
                      
                          # set up shape vars
                          tgt_len, bsz, embed_dim = query.shape
                          src_len, _, _ = key.shape
                          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:
                              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)
                      
                          # prep attention mask
                          if attn_mask is not None:
                              if attn_mask.dtype == torch.uint8:
                                  warnings.warn("Byte tensor for attn_mask in nn.MultiheadAttention is deprecated. Use bool tensor instead.")
                                  attn_mask = attn_mask.to(torch.bool)
                              else:
                                  assert attn_mask.is_floating_point() or attn_mask.dtype == torch.bool, \
                                      f"Only float, byte, and bool types are supported for attn_mask, not {attn_mask.dtype}"
                              # 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")
                      
                          # prep key padding mask
                          if key_padding_mask is not None and key_padding_mask.dtype == torch.uint8:
                              warnings.warn("Byte tensor for key_padding_mask in nn.MultiheadAttention is deprecated. Use bool tensor instead.")
                              key_padding_mask = key_padding_mask.to(torch.bool)
                      
                          # 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.contiguous().view(tgt_len, bsz * num_heads, head_dim).transpose(0, 1)
                          if static_k is None:
                              k = k.contiguous().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.contiguous().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
                              elif attn_mask.dtype == torch.bool:
                                  attn_mask = attn_mask.logical_or(key_padding_mask)
                              else:
                                  attn_mask = attn_mask.masked_fill(key_padding_mask, float("-inf"))
                      
                          # convert mask to float
                          if attn_mask is not None and attn_mask.dtype == torch.bool:
                              new_attn_mask = torch.zeros_like(attn_mask, dtype=torch.float)
                              new_attn_mask.masked_fill_(attn_mask, float("-inf"))
                              attn_mask = new_attn_mask
                      
                          # adjust dropout probability
                          if not training:
                              dropout_p = 0.0
                      
                          #
                          # (deep breath) calculate attention and out projection
                          #
                          attn_output, attn_output_weights = _scaled_dot_product_attention(q, k, v, attn_mask, dropout_p)
                          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)
                      
                          if need_weights:
                              # average attention weights over heads
                              attn_output_weights = attn_output_weights.view(bsz, num_heads, tgt_len, src_len)
                              return attn_output, attn_output_weights.sum(dim=1) / num_heads
                          else:
                              return attn_output, None

### Versions

pytorch 1.10.1
CUDA 10.2

@svenstaro @JackDanger @infil00p @eklitzke 
@soulitzer @infil00p @svenstaro @svenstaro 

### Versions

pytorch 1.10.1
CUDA 10.2