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I think you may have a typo, the function signature, help(cv.cuda.remap) shown below, is the same as the one in your question

remap(...)
    remap(src, xmap, ymap, interpolation[, dst[, borderMode[, borderValue[, stream]]]]) -> dst
    .   @brief Applies a generic geometrical transformation to an image.
    .   
    .   @param src Source image.
    .   @param dst Destination image with the size the same as xmap and the type the same as src .
    .   @param xmap X values. Only CV_32FC1 type is supported.
    .   @param ymap Y values. Only CV_32FC1 type is supported.
    .   @param interpolation Interpolation method (see resize ). INTER_NEAREST , INTER_LINEAR and
    .   INTER_CUBIC are supported for now.
    .   @param borderMode Pixel extrapolation method (see borderInterpolate ). BORDER_REFLECT101 ,
    .   BORDER_REPLICATE , BORDER_CONSTANT , BORDER_REFLECT and BORDER_WRAP are supported for now.
    .   @param borderValue Value used in case of a constant border. By default, it is 0.
    .   @param stream Stream for the asynchronous version.
    .   
    .   The function transforms the source image using the specified map:
    .   
    .   \f[\texttt{dst} (x,y) =  \texttt{src} (xmap(x,y), ymap(x,y))\f]
    .   
    .   Values of pixels with non-integer coordinates are computed using the bilinear interpolation.
    .   
    .   @sa remap

however you are passing a as the second parameter and an invalid borderMode cv.COLOR_RGB2GRAY==7?

cv.cuda.remap(raw,a, mapx, mapy, cv.INTER_CUBIC, borderMode=cv.COLOR_RGB2GRAY)

I think you may have a typo, the function signature, help(cv.cuda.remap) shown below, is the same as the one in your question

remap(...)
    remap(src, xmap, ymap, interpolation[, dst[, borderMode[, borderValue[, stream]]]]) -> dst
    .   @brief Applies a generic geometrical transformation to an image.
    .   
    .   @param src Source image.
    .   @param dst Destination image with the size the same as xmap and the type the same as src .
    .   @param xmap X values. Only CV_32FC1 type is supported.
    .   @param ymap Y values. Only CV_32FC1 type is supported.
    .   @param interpolation Interpolation method (see resize ). INTER_NEAREST , INTER_LINEAR and
    .   INTER_CUBIC are supported for now.
    .   @param borderMode Pixel extrapolation method (see borderInterpolate ). BORDER_REFLECT101 ,
    .   BORDER_REPLICATE , BORDER_CONSTANT , BORDER_REFLECT and BORDER_WRAP are supported for now.
    .   @param borderValue Value used in case of a constant border. By default, it is 0.
    .   @param stream Stream for the asynchronous version.
    .   
    .   The function transforms the source image using the specified map:
    .   
    .   \f[\texttt{dst} (x,y) =  \texttt{src} (xmap(x,y), ymap(x,y))\f]
    .   
    .   Values of pixels with non-integer coordinates are computed using the bilinear interpolation.
    .   
    .   @sa remap

however in the full code sample you are passing a as the second parameter and an invalid borderMode cv.COLOR_RGB2GRAY==7?

cv.cuda.remap(raw,a, mapx, mapy, cv.INTER_CUBIC, borderMode=cv.COLOR_RGB2GRAY)