Cannot remove shape of ch_PP-OCRv4_rec

[stereomatchingkiss]

Describe the bug

paddle2onnx : 1.0.6
onnxsim : 0.4.35

Steps:

1. Convert paddle model to onnx by paddle2onnx

paddle2onnx --model_dir ./ch/ch_PP-OCRv4_rec_infer ^
--model_filename inference.pdmodel ^
--params_filename inference.pdiparams ^
--save_file ./ch/rec_onnx/model.onnx ^
--opset_version 11 ^
--input_shape_dict="{'x':[-1,3,-1,-1]}" ^
--enable_onnx_checker True

2. Simplify model.onnx by onnxsim

python -m onnxsim model.onnx out_simple.onnx

The output still exist layers

Reshape | 6 | 6
Shape | 4 | 3

3. Convert out_simple.onnx to ncnn model

onnx2ncnn.exe ch_PP-OCRv4_rec_simple.onnx out.param out.bin

Error messages:

Shape not supported yet!
Unknown data type 0
Shape not supported yet!
Cast not supported yet!

to=6

Cast not supported yet!

to=7

Unknown data type 0
Unsupported transpose type !
Unsupported squeeze axes !
Unsupported squeeze axes !
Unsupported squeeze axes !
Unknown data type 0
Shape not supported yet!
Cast not supported yet!

to=6

Cast not supported yet!

to=7

Unknown data type 0
Unsupported transpose type !
Unsupported squeeze axes !
Unsupported squeeze axes !
Unsupported squeeze axes !
Unknown data type 0

Model
Model link, link of the document.