On Tuesday, January 19, 2016 at 3:52:12 PM UTC-5, Peter Otten wrote: > Robert wrote: > > > Hi, > > > > When I read a code snippet below, I find I don't know what > > 'self.framelogprob' is on the child class. > > > > > > > > ////// parent class > > class _BaseHMM(BaseEstimator): > > def __init__(self, n_components=1, > > startprob_prior=1.0, transmat_prior=1.0, > > algorithm="viterbi", random_state=None, > > n_iter=10, tol=1e-2, verbose=False, > > params=string.ascii_letters, > > init_params=string.ascii_letters): > > self.n_components = n_components > > ...... > > > > def score_samples(self, X, lengths=None): > > X = check_array(X) > > n_samples = X.shape[0] > > logprob = 0 > > posteriors = np.zeros((n_samples, self.n_components)) > > for i, j in iter_from_X_lengths(X, lengths): > > framelogprob = self._compute_log_likelihood(X[i:j]) > > ....... > > return logprob, posteriors > > > > ////// child class > > class StubHMM(_BaseHMM): > > def _compute_log_likelihood(self, X): > > return self.framelogprob > > ------------- > > > > On Python web, it says that things after dot, such as a class name, are > > attributes. From this definition, 'framelogprob' is an attribute. But when > > I run the command on Canopy: > > > > h.framelogprob > > > --------------------------------------------------------------------------- > > AttributeError Traceback (most recent call > > last) <ipython-input-19-970ee2f3402c> in <module>() > > ----> 1 h.framelogprob > > > > AttributeError: 'StubHMM' object has no attribute 'framelogprob' > > > > > > it doesn't recognize it as an attribute. What is wrong with my > > understanding? > > When you are reading a book, do you expect to be able to understand every > arbitrarily picked sentence without any idea about the surrounding text? > > Widen your view a bit -- the StubHMM class is in a file test_base.py and > therefore it is likely that it is supposed to help with testing rather than > to be used standalone. When you read the complete module to understand more > of the context or just use a tool like grep you'll find the following > snippets: > > h = StubHMM(2) > h.transmat_ = [[0.7, 0.3], [0.3, 0.7]] > h.startprob_ = [0.5, 0.5] > h.framelogprob = self.framelogprob > > h = StubHMM(n_components) > h.framelogprob = self.framelogprob > > So the attribute is set "from the outside". I wouldn't do that, I'd rather > add initializer arguments, but that wasn't the question...
I did not pay attention to the code you post. The attribute has been unclear to me for sometime, especially for a child class. I just realize that class attribute cannot be inherited to its child. Thanks -- https://mail.python.org/mailman/listinfo/python-list
