How do I convert a Blob of known dimensions to a C++ array of floats?

[adammpolak]

From the C++ samples that I follow along I see I can use:

  const SizeVector output_shape = output_info->getTensorDesc().getDims();

to find the dimensions and size of each dimension of an output Blob.

In my case it has 4 dimensions and is: [1,57,32,56]

I also know that each of the values are floats

I also see in the sample I am following along that there is some interface using "MemoryBlob::Cptr" to access the data

example: 

InferenceEngine::MemoryBlob::CPtr moutput = InferenceEngine::as<InferenceEngine::MemoryBlob>(_outBlob);

How can I convert my output Blob into a float[1,57,32,56] in C++? (is that even possible?)

@Wan_Intel 

[Zulkifli_Intel]

Hello Adammpolak,

Thank you for reaching out to us.

We are checking this matter and we will get back to you soon.

Sincerely,

Zulkifli 

[Zulkifli_Intel]

Hello Adammpolak,

We suggest you go through the OpenVINO Hello Reshape SSD C++ Sample and examine these lines of code 146-157 in the sample main.cpp file.

Sincerely,

Zulkifli 

[adammpolak]

Really appreciate the response @Zulkifli_Intel !

So I checked out those lines:

auto moutputHolder = moutput->rmap();
const float* detection = moutputHolder.as<const float*>();

Sorry but this doesn't provide much insight into how to make this a multi-dimensional array...

[Zulkifli_Intel]

Hello adammpolak

There is no internal function or tool available to convert a blob into an array of float. However, it is possible to access the blob data, thus you can explore in writing a function that is capable to perform the aforementioned conversion.

Here are some useful documents that you can refer to:

1) Integrate Inference Engine with Your C++ Application (steps 5 & 7) - Integrate Inference Engine — OpenVINO™ documentation

2) What is a Blob, and how do I Extract Detection Data from a Blob? - What is a Blob, and how do I Extract Detection Data from a Blob? (intel.com)

There were also previous requests in our community forum that you can refer to summarize the idea of converting the blob into float:

1) Trouble Understanding what a Blob is/how to extract info from a blob - Intel Communities

2) detection model's output data - Intel Communities

Sincerely,

Zulkifli

[Zulkifli_Intel]

Hello adammpolak,

This thread will no longer be monitored since we have provided a solution. If you need any additional information from Intel, please submit a new question.

Sincerely,

Zulkifli