# Unable to install package "TransformedLogDensities"

**URL:** <https://discourse.julialang.org/t/unable-to-install-package-transformedlogdensities/102300>\
**Category:** New to Julia\
**Created:** [July 31, 2023, 10:36am UTC](https://discourse.julialang.org/t/unable-to-install-package-transformedlogdensities/102300 "2023-07-31T10:36:04Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Sahil\_Khan](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/sahil_khan/32/47573_2.png) [@Sahil\_Khan](https://discourse.julialang.org/u/Sahil_Khan)\
**Post date:** [July 31, 2023, 10:36am UTC](https://discourse.julialang.org/t/unable-to-install-package-transformedlogdensities/102300/1 "2023-07-31T10:36:04Z")

</div>

I’m getting this requirement message when trying to install TransformedLogDensities. I tried updating packages but it doesn’t help.

```julia
Unsatisfiable requirements detected for package TransformedLogDensities [f9bc47f6]:
 TransformedLogDensities [f9bc47f6] log:
 ├─possible versions are: 1.0.0-1.0.3 or uninstalled
 ├─restricted to versions * by an explicit requirement, leaving only versions: 1.0.0-1.0.3
 └─restricted by compatibility requirements with TransformVariables [84d833dd] to versions: uninstalled — no versions left
   └─TransformVariables [84d833dd] log:
     ├─possible versions are: 0.1.0-0.8.7 or uninstalled
     ├─restricted to versions * by an explicit requirement, leaving only versions: 0.1.0-0.8.7
     └─restricted by compatibility requirements with DynamicHMCModels [6266e5bf] to versions: 0.1.0-0.3.12
       └─DynamicHMCModels [6266e5bf] log:
         ├─possible versions are: 0.1.0-2.1.4 or uninstalled
         └─restricted to versions * by an explicit requirement, leaving only versions: 0.1.0-2.1.4

```

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<div class="post-metadata">

**Author:** ![nilshg](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/nilshg/32/2283_2.png) [@nilshg](https://discourse.julialang.org/u/nilshg)\
**Post date:** [July 31, 2023, 10:47am UTC](https://discourse.julialang.org/t/unable-to-install-package-transformedlogdensities/102300/2 "2023-07-31T10:47:15Z")

</div>

Slightly weird error that you are seeing, this is clearer:

```julia
(jl_ipx5q6) pkg> add TransformedLogDensities
   Resolving package versions...
ERROR: Unsatisfiable requirements detected for package TransformVariables [84d833dd]:
 TransformVariables [84d833dd] log:
 ├─possible versions are: 0.1.0-0.8.7 or uninstalled
 ├─restricted to versions * by an explicit requirement, leaving only versions: 0.1.0-0.8.7
 ├─restricted by compatibility requirements with TransformedLogDensities [f9bc47f6] to versions: 0.6.0-0.8.7
 │ └─TransformedLogDensities [f9bc47f6] log:
 │ ├─possible versions are: 1.0.0-1.0.3 or uninstalled
 │ └─restricted to versions * by an explicit requirement, leaving only versions: 1.0.0-1.0.3
 └─restricted by compatibility requirements with DynamicHMCModels [6266e5bf] to versions: 0.1.0-0.3.12 — no versions left
   └─DynamicHMCModels [6266e5bf] log:
     ├─possible versions are: 0.1.0-2.1.4 or uninstalled
     └─restricted to versions * by an explicit requirement, leaving only versions: 0.1.0-2.1.4

```

`TransformedLogDensities` and `DynamicHMCModels` rely on incompatible versions of `TransformVariables` as dependencies, so you can’t have them in the same environment.

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<div class="post-metadata">

**Author:** ![Sahil\_Khan](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/sahil_khan/32/47573_2.png) [@Sahil\_Khan](https://discourse.julialang.org/u/Sahil_Khan)\
**Post date:** [July 31, 2023, 10:50am UTC](https://discourse.julialang.org/t/unable-to-install-package-transformedlogdensities/102300/3 "2023-07-31T10:50:08Z")

</div>

I was trying this example. If I got it right, you mean if I get rid of DynamicHMCModels it will work?

```julia
using TransformVariables, TransformedLogDensities, LogDensityProblems, LogDensityProblemsAD,
    DynamicHMC, DynamicHMC.Diagnostics, SimpleUnPack, Statistics, Random

struct BernoulliProblem
    n::Int # Total number of draws in the data
    s::Int # Number of draws `==1` in the data
end  

function (problem::BernoulliProblem)(θ)
    @unpack α = θ # extract the parameters
    @unpack n, s = problem # extract the data
    # log likelihood, with constant terms dropped
    s * log(α) + (n-s) * log(1-α)
end

p = BernoulliProblem(20, 10)
p((α = 0.5, )) # make sure that it works

trans = as((α = as𝕀,))
P = TransformedLogDensity(trans, p)
∇P = ADgradient(:ForwardDiff, P)

results = mcmc_with_warmup(Random.default_rng(), ∇P, 1000; reporter = NoProgressReport())

```

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<div class="post-metadata">

**Author:** ![nilshg](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/nilshg/32/2283_2.png) [@nilshg](https://discourse.julialang.org/u/nilshg)\
**Post date:** [July 31, 2023, 10:59am UTC](https://discourse.julialang.org/t/unable-to-install-package-transformedlogdensities/102300/4 "2023-07-31T10:59:04Z")

</div>

If you remove `DynamicHMCModels` from your environment, you will be able to add `TransformedLogDensities` to it. Whether your example will run I do not know, as I don’t know whether `DynamicHMCModels` is needed for it to run.