TF2 error - Failure (`test_inference.R:351`): numerical issues are handled in mcmc

``` r
devtools::load_all(".")
#> ℹ Loading greta
#> ℹ Initialising python and checking dependencies, this may take a moment.
#>
#> ✔ Initialising python and checking dependencies ... done!
#> Loaded Tensorflow version 2.10.0
source(here::here("tests", "testthat", "helpers.R"))
alpha <- normal(0, 1)
x <- matrix(rnorm(6), 3, 2)
y <- t(rnorm(3))
z <- alpha * x
sigma <- z %*% t(z)
distribution(y) <- multivariate_normal(zeros(1, 3), sigma)
m <- model(alpha)

# running with bursts should error informatively
# expect_snapshot_error(
draws <- mcmc(m, verbose = FALSE)
# but no errors!
# )
```

^{Created on 2022-12-09 with [reprex v2.0.2](https://reprex.tidyverse.org)}

Session info

``` r
sessioninfo::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#> setting value
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#> collate en_US.UTF-8
#> ctype en_US.UTF-8
#> tz Australia/Perth
#> date 2022-12-09
#> pandoc 2.19.2 @ /Applications/RStudio.app/Contents/Resources/app/quarto/bin/tools/ (via rmarkdown)
#>
#> ─ Packages ───────────────────────────────────────────────────────────────────
#> ! package * version date (UTC) lib source
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#> htmltools 0.5.3 2022-07-18 [1] CRAN (R 4.2.0)
#> htmlwidgets 1.5.4 2021-09-08 [1] CRAN (R 4.2.0)
#> httpuv 1.6.6 2022-09-08 [1] CRAN (R 4.2.0)
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#> listenv 0.8.0 2019-12-05 [1] CRAN (R 4.2.0)
#> magrittr 2.0.3 2022-03-30 [1] CRAN (R 4.2.0)
#> Matrix 1.5-3 2022-11-11 [1] CRAN (R 4.2.0)
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#> mime 0.12 2021-09-28 [1] CRAN (R 4.2.0)
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#> parallelly 1.32.1 2022-07-21 [1] CRAN (R 4.2.0)
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#> R.cache 0.16.0 2022-07-21 [1] CRAN (R 4.2.0)
#> R.methodsS3 1.8.2 2022-06-13 [1] CRAN (R 4.2.0)
#> R.oo 1.25.0 2022-06-12 [1] CRAN (R 4.2.0)
#> R.utils 2.12.2 2022-11-11 [1] CRAN (R 4.2.0)
#> R6 2.5.1 2021-08-19 [1] CRAN (R 4.2.0)
#> Rcpp 1.0.9 2022-07-08 [1] CRAN (R 4.2.0)
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#> sessioninfo 1.2.2 2021-12-06 [1] CRAN (R 4.2.0)
#> shiny 1.7.3 2022-10-25 [1] CRAN (R 4.2.0)
#> stringi 1.7.8 2022-07-11 [1] CRAN (R 4.2.0)
#> stringr 1.5.0 2022-12-02 [1] CRAN (R 4.2.0)
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#> tensorflow 2.9.0 2022-05-21 [1] CRAN (R 4.2.0)
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#>
#> [1] /Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/library
#>
#> V ── Loaded and on-disk version mismatch.
#> P ── Loaded and on-disk path mismatch.
#>
#> ─ Python configuration ───────────────────────────────────────────────────────
#> python: /Users/nick/Library/r-miniconda-arm64/envs/greta-env-tf2/bin/python
#> libpython: /Users/nick/Library/r-miniconda-arm64/envs/greta-env-tf2/lib/libpython3.8.dylib
#> pythonhome: /Users/nick/Library/r-miniconda-arm64/envs/greta-env-tf2:/Users/nick/Library/r-miniconda-arm64/envs/greta-env-tf2
#> version: 3.8.13 | packaged by conda-forge | (default, Mar 25 2022, 06:05:16) [Clang 12.0.1 ]
#> numpy: /Users/nick/Library/r-miniconda-arm64/envs/greta-env-tf2/lib/python3.8/site-packages/numpy
#> numpy_version: 1.23.2
#> tensorflow: /Users/nick/Library/r-miniconda-arm64/envs/greta-env-tf2/lib/python3.8/site-packages/tensorflow
#>
#> NOTE: Python version was forced by use_python function
#>
#> ──────────────────────────────────────────────────────────────────────────────
```