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Interpretation of deepmind's latest paper: the causal reasoning algorithm in discrete probability tree is proposed for the first time
2020-11-08 12:56:00 【EXP {MM/YYYYY}】
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At present , Some of the frontiers AI Researchers are looking for clear semantic models to represent context specific causal dependencies , This is necessary for causal induction , stay DeepMind This probability tree model can be seen in the algorithm of .
Probability tree graph is used to represent probability space , A tree diagram can describe a series of independent events or conditional probabilities .
The nodes on the probability tree represent an event and its probability , The root node represents a probability equal to 1 Specific events of , The set of sibling nodes represents the parent event (the parent event.) A detailed division of .
probability ( A series of events that cause a particular node to occur )= probability ( The node )* probability ( Parent node ).
Probability trees have been around for decades , But it hasn't been ML and AI Too much attention from fans .
new DeepMind The paper 《 Causal reasoning algorithm in probability tree 》 wrote ,“ Probability tree is one of the simplest models of causal generation .” According to the author , The above algorithm is the first specific algorithm for causal reasoning in discrete probability trees .
Scientists in the field of cognition say , Humans naturally learn to reason by drawing causal relationships from observations , And it's very effective . Although observational data are limited and scarce , But people can quickly understand the causal structure , For example, by observing the co-occurrence frequency of causality and the interaction between physical objects .
Causal induction is a classic problem in machine learning and statistics . Causal Bayesian Networks (CBN) The model can describe the causal dependency in causal induction , But it can't express context specific independence .
According to the DeepMind The team says , DeepMind Covering the entire causal hierarchy and random propositions 、 Operations on causal events , And the causal reasoning is further extended to “ A very general class of discrete stochastic processes ”.
DeepMind The team's focus is on finite probability trees , And get the following specific algorithm :
Compute the following to form the minimum representation of any event :
Propositional calculus (Propositional calculus)
Causal precedent (Causal precedences)
Calculate the basic operations of the following three causal hierarchies :
Conditions
Interventions
counterfactual
Link to the original text :
https://www.marktechpost.com/2020/10/30/deepmind-research-introduces-algorithms-for-causal-reasoning-in-probability-trees/
source :
https://syncedreview.com/2020/10/29/deepmind-introduces-algorithms-for-causal-reasoning-in-probability-trees/
The paper :
https : //arxiv.org/pdf/2010.12237.pdf
GitHub:
https://github.com/deepmind/deepmindresearch/tree/master/causal_reasoning
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