Question about extract() with Slice layer -- all Out w h c are Zero

[anshan-XR-ROB]

Hi,
I use the NCNN library to extract the blob using:
ex.extract(pose_0408_param_id::BLOB_Mconv7_stage2,out);
However, the out W H C are all 0. The net prototxt is like following:
layer {
name: "data"
type: "Input"
top: "data"
input_param { shape: { dim: 1 dim: 4 dim: 368 dim: 368 } }
}
layer {
name: "image"
type: "Slice"
bottom: "data"
top: "image"
top: "center_map"
slice_param {
slice_point: 3
axis: 1
}
}
layer {
name: "pool_center_lower"
type: "Pooling"
bottom: "center_map"
top: "pool_center_lower"
pooling_param {
pool: AVE
kernel_size: 9
stride: 8
}
}
I tried to extract BLOB_pool_center_lower, But also get 0. The BLOB_data is right.
Does there any error with Slice layer?

[northeastsquare]

@AnshanTJU Have you solve it, I also met this. Could you share your final solution?