Trouble managing VRAM with VapourSynth dpir_ncnn & ncnn_vulkan : Memory not clearing after heavy filtering and segment slicing

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how to clear vram?I'm facing an issue with VRAM not getting cleared despite my efforts to optimize memory usage. I'm performing intensive filtering using VapourSynth, and I have multiple segments that require different filtering settings. To achieve this, I'm using slicing operations and creating separate clips for each segment. However, even after removing unused variables using 'del', the VRAM doesn't seem to free up properly. As a result, I'm running out of VRAM during the processing. I would greatly appreciate any suggestions or solutions to help me address this problem.