tests/testthat/_snaps/inference.md

In greta-dev/greta: Simple and Scalable Statistical Modelling in R

bad mcmc proposals are rejected

Code
  draws <- mcmc(m, chains = 1, n_samples = 2, warmup = 0, verbose = FALSE,
    initial_values = initials(z = 1e+120))
Condition
  Error in `self$check_valid_parameters()`:
  ! The log density could not be evaluated at these initial values
  Try using these initials as the `values` argument in `calculate()` to see what values of subsequent <greta_array>s these initial values lead to.

Code
  mcmc(m, chains = 1, n_samples = 1, warmup = 0, verbose = FALSE)
Condition
  Error in `self$check_reasonable_starting_values()`:
  ! Could not find reasonable starting values after 20 attempts.
  Please specify initial values manually via the `initial_values` argument

mcmc handles initial values nicely

Code
  draws <- mcmc(m, warmup = 10, n_samples = 10, verbose = FALSE, chains = 2,
    initial_values = inits)
Condition
  Error in `prep_initials()`:
  ! The number of provided initial values does not match chains
  3 sets of initial values were provided, but there are 2 chains

Code
  draws <- mcmc(m, warmup = 10, n_samples = 10, verbose = FALSE, chains = 2,
    initial_values = inits)
Condition
  Error in `FUN()`:
  ! The initial values provided have different dimensions than the named <greta_array>s

Code
  draws <- mcmc(m, warmup = 10, n_samples = 10, chains = 2, initial_values = inits,
    verbose = FALSE)
Message
  Only one set of initial values was provided, and was used for all chains

progress bar gives a range of messages

Code
  draws <- mock_mcmc(1010)
Message

    sampling          1010/1010 | eta:  0s | <1% bad

Code
  draws <- mock_mcmc(500)
Message

    sampling            500/500 | eta:  0s | 2% bad

Code
  draws <- mock_mcmc(10)
Message

    sampling =========== 10/10 | eta:  0s | 100% bad

samples has object names

Code
  rownames(summary(draws)$statistics)
Output
  [1] "a"      "b[1,1]" "b[2,1]" "b[3,1]"

Code
  rownames(summary(c_draws)$statistics)
Output
  [1] "c[1,1]" "c[2,1]" "c[3,1]"

model errors nicely

Code
  model(a, b)
Condition
  Error in `model()`:
  ! `model()` arguments must be <greta_array>s
  The following object passed to `model()` is not a <greta array>:
  "a"

initials works

Code
  initials(a = FALSE)
Condition
  Error in `initials()`:
  ! initial values must be numeric

Code
  initials(FALSE)
Condition
  Error in `initials()`:
  ! All initial values must be named

Code
  initials(a = 3)
Output
  a greta initials object with values:

  $a
       [,1]
  [1,]    3

prep_initials errors informatively

Code
  mcmc(m, initial_values = FALSE, verbose = FALSE)
Condition
  Error in `prep_initials()`:
  ! `initial_values` must be an initials object created with `initials()`, or a simple list of initials objects

Code
  mcmc(m, initial_values = list(FALSE), verbose = FALSE)
Condition
  Error in `prep_initials()`:
  ! `initial_values` must be an initials object created with `initials()`, or a simple list of initials objects

Code
  mcmc(m, chains = 1, initial_values = initials(g = 1), verbose = FALSE)
Condition
  Error in `check_greta_arrays_associated_with_model()`:
  ! Some <greta_array>s passed to `initials()` are not associated with the model:
  `g`

Code
  mcmc(m, chains = 1, initial_values = initials(f = 1), verbose = FALSE)
Condition
  Error in `check_nodes_all_variable()`:
  ! Initial values can only be set for variable <greta_array>s

Code
  mcmc(m, chains = 1, initial_values = initials(z = 1), verbose = FALSE)
Condition
  Error in `check_nodes_all_variable()`:
  ! Initial values can only be set for variable <greta_array>s

Code
  mcmc(m, chains = 1, initial_values = initials(b = -1), verbose = FALSE)
Condition
  Error in `unsupported_error()`:
  ! Some provided initial values are outside the range of values their variables can take

Code
  mcmc(m, chains = 1, initial_values = initials(d = -1), verbose = FALSE)
Condition
  Error in `unsupported_error()`:
  ! Some provided initial values are outside the range of values their variables can take

Code
  mcmc(m, chains = 1, initial_values = initials(e = 2), verbose = FALSE)
Condition
  Error in `unsupported_error()`:
  ! Some provided initial values are outside the range of values their variables can take

samplers print informatively

Code
  hmc()
Output
  hmc sampler object with parameters:
    Lmin = 5, Lmax = 10, epsilon = 0.1, diag_sd = 1

Code
  rwmh()
Output
  rwmh sampler object with parameters:
    proposal = normal, epsilon = 0.1, diag_sd = 1

Code
  slice()
Output
  slice sampler object with parameters:
    max_doublings = 5

Code
  hmc(Lmin = 1)
Output
  hmc sampler object with parameters:
    Lmin = 1, Lmax = 10, epsilon = 0.1, diag_sd = 1

greta-dev/greta documentation built on Dec. 21, 2024, 5:03 a.m.