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Update VItamin and Bilby with Different Noises
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Jun 01, 2021
by
Wei Changfeng
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VItamin-and-Bilby-with-Different-Noises.md
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@@ -54,32 +54,42 @@ Fig.14 random seed = 10000
We did PE run provided by Bilby twice to see the consistency of the results.
## (1) 4 parameters
### (i) posterior
Fig.15

Fig.16

### (ii) JS divergence
#### (a) chirp mass
JSD = 0.0498
Fig.17

#### (b) mass ratio
JSD = 0.0462
Fig.18

#### (c) distance
JSD = 0.0581
Fig.19

It can be seen that the consistency of results is good.
## (2) 15 parameters
### (i) posterior
Fig.20

Fig.21

### (ii) JS divergence
#### (a) chirp mass
JSD = 0.0438
Fig.22

#### (b) mass ratio
JSD = 0.0472
Fig.23

#### (c) distance
JSD = 0.0359
Fig.24

It can be seen that the consistency of results is good.
Therefore, two tutorial scripts(4 and 15 parameters) can be accepted that they ran well on my laptop.
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@@ -152,49 +162,64 @@ result = bilby.run_sampler(
## (3) 15 parameters with (m1,m2) instead of (chirp mass, mass ratio)
We get results with good consistency in the sections above. This is to test if (m1,m2) will decrease the convergence.
### (i) posterior
Fig.25

Fig.26

### (ii) JS divergence
#### (a) m1
JSD = 0.0372
Fig.27

#### (b) m2
JSD = 0.0459
Fig.28

#### (a) distance
JSD = 0.0336
Fig.29

It can be seen that the consistency of results is still good. Hence we decide to next test how BH encounter performs in the PE run.
# 4. BH encounter
## (1) BH enoucnter with marginalization(distance, time, phase)
### (i) posterior
Fig.30

Fig.31

### (ii) JS divergence
#### (a) m1
JSD = 0.1658
Fig.32

#### (b) m2
JSD = 0.1759
Fig.33

#### (a) distance
JSD = 0.1096
Fig.34

Wrong template (using BBH template to model BH encounter) reduces the consistency of results.
## (2) BH enoucnter without marginalization(distance, time, phase)
### (i) posterior
Fig.35

Fig.36

### (ii) JS divergence
#### (a) m1
JSD = 0.6390
Fig.37

#### (b) m2
JSD = 0.4551
Fig.38

#### (a) distance
JSD = 0.2937
Fig.39

Lack of Marginalization of distance, phase and time reduces the consistency of results further.
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@@ -205,10 +230,14 @@ https://gilsay.physics.gla.ac.uk/gitlab/wei.changfeng/weichangfeng_project/tree/
https://gilsay.physics.gla.ac.uk/gitlab/wei.changfeng/weichangfeng_project/tree/master/2021_05/test_2
Though they produced the same number of samples this time, I checked the first ten lines of the sample files and they are not the same.
### (i) test 1
Fig.40

Fig.41

### (i) test 2
Fig.42

Fig.43

## (2) Fast tutorial using cpnest sampler.
The result still can't be reproduced exactly the same. All the files are uploaded here:
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@@ -216,6 +245,8 @@ https://gilsay.physics.gla.ac.uk/gitlab/wei.changfeng/weichangfeng_project/tree/
https://gilsay.physics.gla.ac.uk/gitlab/wei.changfeng/weichangfeng_project/tree/master/2021_05/test_cpnest_2
They produced the different number of samples. I checked the first ten lines of the sample files and they are not the same.
### (i) test 1
Fig.44

### (i) test 2
Fig.45

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