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[Docs] How to convert rtmpose3d to tensorRT #3245

@zszz3

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@zszz3

📚 The doc issue

I exported the RTMPose3D model to ONNX and got three outputs with shapes:
(1, 133, 576)
(1, 133, 768)
(1, 133, 576)

Mycode is

import torch
from mmpose.apis import init_model
pose_estimator = init_model(
'./configs/rtmw3d-l_8xb64_cocktail14-384x288.py',
'rtmw3d-l_8xb64_cocktail14-384x288-794dbc78_20240626.pth',
device='cpu')

input = torch.randn(1, 3, 384, 288)
data_samples = {}

torch.onnx.export(
    pose_estimator,
    (input, data_samples),
    "model.onnx",
    input_names=["input"],
    output_names=["output"],
    verbose=True
) 
onnx_model = onnx.load("model.onnx")
onnx.checker.check_model(onnx_model)

for i in onnx_model.graph.input:
    print("Input:", i.name, i.type)
for o in onnx_model.graph.output:
    print("Output:", o.name, o.type)

Could you clarify the meaning of these three outputs? Also, which one should be used for 3D keypoint inference?

Suggest a potential alternative/fix

No response

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