AttributeError: 'NoneType' object has no attribute 'rho'

回答: AttributeError: 'NoneType' object has no attribute 'rho'错误是由于变量为None而导致的。根据引用\[1\]和引用\[2\]的内容，Nonetype类型只有一个None，它没有任何内建方法和属性。因此，当出现NoneType对象没有某个属性的错误时，通常是因为变量被赋值为None。在你的代码中，出现了AttributeError: 'NoneType' object has no attribute 'rho'错误，可能是因为变量model被赋值为None。你可以检查代码中第14行的变量model是否被正确赋值。另外，引用\[3\]中的代码片段是一些导入库和模块的语句，并与你的问题没有直接关联。
#### 引用[.reference_title]
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