Genie Sampling and fixed nodes
Re: Genie Sampling and fixed nodes
but why are hard evidences not sampled? (in GENIE, not in SMILE there I'm in the beginning, you know )
Re: Genie Sampling and fixed nodes
Well, hard evidence means basically your are absolute sure.
Let's say in a weather model you observe it's raining. There's no discusion and setting this evidence 'raining' in the node translates into giving it a probability distribution of 1.0 for 'raining' and 0 for any other option here
In Genie you click the state it should be in the set evidence list (right mouse button click on node)
Do you see what I mean?
Let's say in a weather model you observe it's raining. There's no discusion and setting this evidence 'raining' in the node translates into giving it a probability distribution of 1.0 for 'raining' and 0 for any other option here
In Genie you click the state it should be in the set evidence list (right mouse button click on node)
Do you see what I mean?
Re: Genie Sampling and fixed nodes
Yes, that means that as long as I'm not sure about my evidence, the sampling helps me to verify.
So, in my model e.g. I have the prior of which colors are possible and how often. This is exact knowledge.
The node for that has as much as states as possible colors.
That means, I cannot set a single color to hard evidence, because the other colors also have a value of their occurences.
But if I remodel the BN in that way, that I get single nodes for the specific colors, I can just set the colors to true or false, but I cannot model the (co)relation of the colors.
Thats it. Exactly.
So, in my model e.g. I have the prior of which colors are possible and how often. This is exact knowledge.
The node for that has as much as states as possible colors.
That means, I cannot set a single color to hard evidence, because the other colors also have a value of their occurences.
But if I remodel the BN in that way, that I get single nodes for the specific colors, I can just set the colors to true or false, but I cannot model the (co)relation of the colors.
Thats it. Exactly.
Re: Genie Sampling and fixed nodes
I don't quite understand what you mean by this.Yes, that means that as long as I'm not sure about my evidence, the sampling helps me to verify.
Why and how would sampling help you verify the evidence?
Maybe you somehow relate the sampling to the evidence you provide, I don't think that's right.
Maybe it helps if you see the inference algorithm you use as a black box that get the network and the set evidence as input and outputs posterior distributions for the nodes of the network.
You shouldn't worry about how the calculations are done, just that both (exact/sampling) are providing you with the posterior conditional distributions.
Re: Genie Sampling and fixed nodes
In that way that it varies the evidence too. Not important I think I understand you.Why and how would sampling help you verify the evidence?
Okay I try thatMaybe you somehow relate the sampling to the evidence you provide, I don't think that's right.
Maybe it helps if you see the inference algorithm you use as a black box that get the network and the set evidence as input and outputs posterior distributions for the nodes of the network.
You shouldn't worry about how the calculations are done, just that both (exact/sampling) are providing you with the posterior conditional distributions.
I have no other solution yet, so I trust
Thank you so much