编译模型的时候出现error: failed to legalize operation 'MGB.ConvBias'

dump代码如下
@jit.trace(symbolic=True, capture_as_const=True)
def fun(data, *, net):
pred = net(data)
return pred

fun(data, net=model)
fun.dump("test.mge", arg_names=["data"],optimize_for_inference=False, enable_fuse_conv_bias_nonlinearity=False, enable_fuse_conv_bias_with_z=False)

Start with the provided jit.trace and fun.dump reproduction, then search the compiler for legalization handling of the 'MGB.ConvBias' operation. Reproduce the failure with the listed fusion options and trace where legalization stops; done means the shown model compiles successfully or the unsupported operation is reported with a clear resolution.

Written by the indexing model from the issue text.