Prediction demo nn

[Chengfeng-Jia]

Add prediction section in Kalman-LSTM demo regard to issue #15.

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Codecov Report

Base: 80.21% // Head: 76.76% // Decreases project coverage by -3.44% :warning:

Coverage data is based on head (ecf7847) compared to base (035e80c). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #38 +/- ## ========================================== - Coverage 80.21% 76.76% -3.45% ========================================== Files 10 10 Lines 1122 1162 +40 ========================================== - Hits 900 892 -8 - Misses 222 270 +48 ``` | [Impacted Files](https://codecov.io/gh/biaslab/RxInfer.jl/pull/38?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=biaslab) | Coverage Δ | | |---|---|---| | [src/graphppl.jl](https://codecov.io/gh/biaslab/RxInfer.jl/pull/38/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=biaslab#diff-c3JjL2dyYXBocHBsLmps) | `73.98% <0.00%> (-13.03%)` | :arrow_down: | | [src/inference.jl](https://codecov.io/gh/biaslab/RxInfer.jl/pull/38/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=biaslab#diff-c3JjL2luZmVyZW5jZS5qbA==) | `74.48% <0.00%> (-0.62%)` | :arrow_down: | | [src/model.jl](https://codecov.io/gh/biaslab/RxInfer.jl/pull/38/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=biaslab#diff-c3JjL21vZGVsLmps) | `85.88% <0.00%> (-0.59%)` | :arrow_down: | | [src/score/bfe.jl](https://codecov.io/gh/biaslab/RxInfer.jl/pull/38/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=biaslab#diff-c3JjL3Njb3JlL2JmZS5qbA==) | `92.68% <0.00%> (-0.35%)` | :arrow_down: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=biaslab). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=biaslab)

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