feat: use GPU for index creation. (#540)

Bump lance to 0.8.3 to include GPU training

---------

Co-authored-by: Rob Meng <rob.xu.meng@gmail.com>

docs/src/ann_indexes.md

@@ -68,6 +68,12 @@ a single PQ code.
   <figcaption>IVF_PQ index with <code>num_partitions=2, num_sub_vectors=4</code></figcaption>
 </figure>
 
+### Use GPU to build vector index
+
+Lance Python SDK has experimental GPU support for creating IVF index.
+You can specify the GPU device to train IVF partitions via
+
+- **accelerator**: Specify to `"cuda"`` to enable GPU training.
 
 ## Querying an ANN Index
 

docs/test/requirements.txt

@@ -1,5 +1,8 @@
-lancedb @ git+https://github.com/lancedb/lancedb.git#egg=subdir&subdirectory=python
+-e ../../python
 numpy
 pandas
 pylance
-duckdb
+duckdb
+--extra-index-url https://download.pytorch.org/whl/cpu
+torch
+