luoyetx opened a new issue #10695: SymbolBlock has no `_reg_params` which cause save/load params fails URL: https://github.com/apache/incubator-mxnet/issues/10695 ## Description block with symbol block as child doesn't save/load symbol block's parameters. ## Environment info (Required) mxnet==1.2.0b20180425 ## Steps to reproduce ```python import mxnet as mx from mxnet import gluon as gl, nd from mxnet.gluon import nn class Net(gl.HybridBlock): def __init__(self): super(Net, self).__init__() with self.name_scope(): backbone = gl.model_zoo.vision.resnet50_v1() data = mx.sym.var('data') featnames = ['stage1_activation2', 'stage2_activation3', 'stage3_activation5'] out_names = ['_'.join([backbone.name, featname, 'output']) for featname in featnames] internals = backbone(data).get_internals() outs = [internals[out_name] for out_name in out_names] self.backbone = gl.SymbolBlock(outs, data, params=backbone.collect_params()) self.body = nn.Conv2D(3, 1) def hybrid_forward(self, F, x): x = self.body(x) return self.backbone(x) ctx = mx.cpu() net = Net() net.initialize(mx.init.Normal(), ctx=ctx) net.hybridize() net(nd.random.normal(shape=(1, 3, 224, 224))) net.save_params('./test.params') for k, v in nd.load('./test.params').items(): print(k) for k, v in net.collect_params().items(): print(k) ``` ## What have you tried to solve it? add `_reg_params` to symbol block solves this problem. ```python self._reg_params = self._params ```
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