You will be shown an excerpt from a computer science scientific research paper, followed by a question about the paper. Please answer the question. Do not include any text in your response other than the answer.

Context: Scale As in most existing SR methods, SRCNN is trained for a single scale factor and is supposed to work only with the specified scale. Thus, if a new scale is on demand, a new model has to be trained. To cope with multiple scale SR (possibly including fractional factors), we need to construct individual single scale SR system for each scale of interest.

Question: What is the goal behind constructing individual single scale SR system?
Since SRCNN is only trained for a single scale, we need to train individual single scale SRCNNs to deal with multiple scales.