sample_ppc bug fix #2748
sample_ppc bug fix #2748
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My fix in #2725 to use all chains breaks the `sample_ppc([point]...)` and also the progress bar. These issue should be fix here now and also add test for sample_ppc from a list.
pymc3/sampling.py
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| nchain = trace.nchains | ||
| try: | ||
| nchain = trace.nchains | ||
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| nchain = tr.nchains | ||
| len_trace = len(tr) | ||
| try: | ||
| nchain = tr.nchains |
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Why the try/except? tr.nchains works even for traces with only 1 chain, right?
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Not work if you pass a list, it doesnt have .nchains. For example, you can do:
with model:
map1 = pm.find_MAP()
ppc = pm.sample_ppc([map1], sample=100, model=model)There was a problem hiding this comment.
but sample_ppc_w is always expecting a list of traces
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yeah I was thinking the same, but it is a bit of a corner case as sample_ppc allows a list, and sample_ppc_w should as well, something like:
sample_ppc_w([[map1], [map2]], [model1, model2])
what do you think?
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You are right, a general solution is a better option.
Could you add a line in the doctring of sample_ppc_w, something similar as what you did for sample_pcc?
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My fix in #2725 to use all chains breaks the
sample_ppc([point]...)and also the progress bar. These issue should be fix here now and also add test for sample_ppc from a list.