Multiple Secondary Models as Primary Engine using Back to back

Accelerated Computing Intelligent Video Analytics DeepStream SDK
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I have 3 questions:

Q1) Is it possible to have 4 different models used within back to back all as primary engines?

Q2) Is it possible to have 2 primary models and multiple secondary models?

Q3) I have noticed there are multiple instances of deepstream within a deepstream app. Can someone point me to the appropriate source?

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Q1) Is it possible to have 4 different models used within back to back all as primary engines?

→ yes, it’s possible to run with all nvinfer set to primary mode.

Q2) Is it possible to have 2 primary models and multiple secondary models?

→ yes, possible.

Q3) I have noticed there are multiple instances of deepstream within a deepstream app. Can someone point me to the appropriate source?

→ multiple instance of deepstream within deepstream-app, do not quite understand what you mean.

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Thank you!