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pymc.backends.base.MultiTrace — PyMC 5.25.1 documentation

class pymc.backends.base.MultiTrace(straces)[source]#

Main interface for accessing values from MCMC results.

The core method to select values is get_values. The method to select sampler statistics is get_sampler_stats. Both kinds of values can also be accessed by indexing the MultiTrace object. Indexing can behave in four ways:

1. Indexing with a variable or variable name (str) returns all values for that variable, combining values for all chains.

   Slicing after the variable name can be used to burn and thin the samples.

   >>> trace[varname, 1000:]
   

   For convenience during interactive use, values can also be accessed using the variable as an attribute.

2. Indexing with an integer returns a dictionary with values for each variable at the given index (corresponding to a single sampling iteration).

3. Slicing with a range returns a new trace with the number of draws corresponding to the range.

4. Indexing with the name of a sampler statistic that is not also the name of a variable returns those values from all chains. If there is more than one sampler that provides that statistic, the values are concatenated along a new axis.

For any methods that require a single trace (e.g., taking the length of the MultiTrace instance, which returns the number of draws), the trace with the highest chain number is always used.

Attributes:

nchains: int

Number of chains in the MultiTrace.

chains: `List[int]`

List of chain indices

report: str

Report on the sampling process.

varnames: `List[str]`

List of variable names in the trace(s)

Methods

Attributes

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