Faster R-CNN Error "Error using gpuArray/subsref"

Hi, I am new to deep learning so need to resolve this issue.

I am working on object detection task. My dataset is of 50 images each have 4 objects on average to be detected. I followed the example Object Detection Using Faster R-CNN Deep Learning. I am getting the following error:

"Error using gpuArray/subsref

Out of memory on device. To view more detail about available memory on the GPU, use 'gpuDevice()'. If the problem persists, reset the GPU by calling 'gpuDevice(1)'."

How to get rid of this issue. I serched internet and found some e.g Solution but still nothing worked in my case. I have Matlab 2018b and GPU is NVIDIA GeForce GTX 1070.

Need recommendations to tackle this issue. Thank you.

[Tahir Mahmood]

@ Joss Knight ,please have a look.