如何将MNN的numpy对象转换为numpy对象？

[Edgar-qiqi]

# NHWC to NC4HW4
input_var = expr.convert(matrix, expr.NC4HW4)

# 执行推理
output_var = model.forward(input_var)#这里的bug
print(output_var)
feature=numpy.array(output_var,dtype=numpy.float32)

output_var为：
array([[ 0.01988822, 0.02429761, 0.05342057, ..., 0.01027369,
-0.07523413, 0.04102331],
[ 0.01270534, -0.01765889, 0.00880913, ..., 0.00439602,
-0.00936374, 0.06313592],......
这是官方文档推理时的model示例代码想将output_var转换为numpy的对象，因为MNN的numpy无法做output_var.T

[github-actions]

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