Subscript `O` is a matrix, the data `X[O]` must have size 1.

Hi Brandon,

Thanks for the great explanation here. I'm using isotree for outlier detection and this has been super useful.

I'm trying to run your example code but unfortunately I am getting the following error when I run your code verbatim, has something changed under the hood?:

ex <- fastshap::explain(ifo, X = X, newdata = max.x, pred_wrapper = pfun, 
+                          adjust = TRUE, nsim = 1000)
Error:
! Subscript `O` is a matrix, the data `X[O]` must have size 1.
Run `rlang::last_error()` to see where the error occurred.
> rlang::last_error()
<error/tibble_error_subset_matrix_must_be_scalar>
Error:
! Subscript `O` is a matrix, the data `X[O]` must have size 1.
---
Backtrace:
  1. fastshap::explain(...)
  2. fastshap:::explain.default(...)
  3. fastshap:::explain.default(...)
  4. plyr::laply(...)
  5. plyr::llply(...)
  7. base::lapply(pieces, .fun, ...)
  8. fastshap FUN(X[[i]], ...)
  9. base::replicate(...)
 10. base::sapply(...)
 11. base::lapply(X = X, FUN = FUN, ...)
 12. fastshap FUN(X[[i]], ...)
 13. fastshap:::explain_column(...)
 15. tibble:::`[<-.tbl_df`(`*tmp*`, O, value = `<dbl>`)
 16. tibble:::tbl_subassign_matrix(x, j, value, j_arg, substitute(value))
Run `rlang::last_trace()` to see the full context.

The only change I made to the code was removing the reference to random_seed = 2223 when fitting the isolation tree model, this doesn't appear to be an argument within the isolation.forest function: https://cran.r-project.org/web/packages/isotree/isotree.pdf

bgreenwell / fastshap

Subscript `O` is a matrix, the data `X[O]` must have size 1. #37