Problem: the approximate method can still be slow for many trees
catboost version: master
Operating System: ubuntu 18.04
CPU: i9
GPU: RTX2080

Would be good to be able to specify how many trees to use for shapley. The model.predict and prediction_type versions allow this. lgbm/xgb allow this.

Heston model has accurate density approximations for European option prices, which are of interest.

The module implementing this method should live under tf_quant_finance/volatility/heston_approximation.py. It should support both European option puts and calls approximations. Tests should be in heston_approximation_test.py in the same folder.

The standard accelerate test suite, used by all the backends, can be quite slow. Several of the tests are significantly slower than the others, for example segmented folds and scans, which I believe is because the reference implementations are very inefficient. Writing some more efficient reference implementations (e.g. using Data.Vector.Unboxed) should help speed things up.

Exchange a package that is marked as deprecated.
Seen in CI as warning in the apt install step with CUDA 10.1.243.

To Do:

• double check this works with CUDA 9.2 (current docker image; check minimal version constraint for Nvidia NGC) or...
• update Docker image to newer CUDA

Just an FYI whilst I was trawling through the ROCm GitHub page:

https://rocmdocs.amd.com/en/latest/Programming_Guides/Programming-Guides.html#

The problem is that the OpenCL types in https://github.com/triSYCL/triSYCL/blob/master/include/triSYCL/opencl_types.hpp are defined on the host according to the x86-64 Linux ABI which depends on the CPU & OS instead of using the description from https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_C.html#built-in-scalar-data-types

Note that the system-wide cl_size_t has been removed

Ensure all examples are updated to reflect changes introduced by #136. This may also require updating the google colab and potentially some of the existing blog posts.

• M: Mute (muting is not a node-wrangler feature, but I include it here because it's also node editor quality of life)
• Ctrl+Shift+LMB: View texture, material or volume node (create emission viewer if necessary)
• Ctrl+T: Create image node+attached mapping node
• Ctrl+Shift+T: Open file picker, user selects a bunch of textures, create disney material with textures attached to t