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improve type error message for 'fn' in sample function #2175

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improve type error message for 'fn' in sample function #2175

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7 changes: 4 additions & 3 deletions numpyro/primitives.py
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Original file line number Diff line number Diff line change
Expand Up @@ -181,10 +181,11 @@ def sample(
)
if not isinstance(fn, numpyro.distributions.Distribution):
type_error = TypeError(
"It looks like you tried to use a fn that isn't an instance of "
"Invalid type for 'fn': expected an instance of "
"numpyro.distributions.Distribution, funsor.Funsor or "
"tensorflow_probability.distributions.Distribution. If you're using "
"funsor or tensorflow_probability, make sure they are correctly installed."
"tensorflow_probability.distributions.Distribution, "
f"but received {type(fn).__name__}. If you're using funsor or "
"tensorflow_probability, make sure they are correctly installed."
)

# fn can be a funsor.Funsor, but this won't be installed for all users
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