When starting a trained model deployment the user can tweak performance
by setting the `model_threads` and `inference_threads` parameters.
These parameters are hard to understand and cause confusion.
This commit renames these as well as the fields where their values are
reported in the stats API.
- `model_threads` => `number_of_allocations`
- `inference_threads` => `threads_per_allocation`
Now the terminology is as follows.
A model deployment starts with a requested `number_of_allocations`.
Each allocation means the model gets another thread for executing
parallel inference requests. Thus, more allocations should increase
throughput. In its turn, each allocation is may be using a number
of threads to parallelize each individual inference request.
This is the `threads_per_allocation` setting and increases inference
speed (which might also result in improved throughput).
This commit adds a new `_ml/trained_models/{model_id}/_infer` API. This api works for both native NLP models and supervised models trained via Data Frame analytics.
The format of the API is the same as the old `_ml/trained_models/{model_id}/deployment/_infer`. Taking a `docs` and an `inference_config` parameter.
This PR also deprecates the old experimental `_ml/trained_models/{model_id}/deployment/_infer` API.
The biggest difference is that the response now nests all results under an "inference_results" object.
closes: https://github.com/elastic/elasticsearch/issues/86032
This renames the internal concept of a trained model allocation into an assignment.
Now models are assigned to a node and routes created for inference. Not "allocated".
This is an internal rename only. The user facing concepts of trained models and deployments are untouched.
This reverts commit 4eaedb265d.
On further investigation of how to improve allocation of trained models,
we concluded that being able to set `inference_threads` in combination with
`model_threads` is fundamental for scalability.
Starting a trained model deployment the user may set values for `inference_threads`
of `model_threads`. The first improves latency whereas the latter improves throughput.
It is easier to reason on how a model allocation uses resources if we ensure only
one of those two may be greater than one. In addition, it allows us to distribute
the cores of the ML nodes in the cluster across the model allocations in the future.
This commit adds a validation that prevents both `inference_threads` and `model_threads`
to be greater than one.
Throughput is measured as the number of inference requests
processed per minute. The node level stats peak_throughput_per_minute,
throughput_last_minute and average_inference_time_ms_last_minute are
added with a deployment level stat peak_throughput_per_minute which
is the summed throughput of all nodes.
This commit adds initial windowing support for text_classification tasks.
Specifically, a user can now indicate a span (non-negative) indicating the tokenization windowing span when creating
sub-sequences.
Default value is span: -1 indicates that no windowing should take place.
This commit adds support for MPNet based models.
MPNet models differ from BERT style models in that:
- Special tokens are different
- Input to the model doesn't require token positions.
To configure an MPNet tokenizer for your pytorch MPNet based model:
```
"tokenization": {
"mpnet": {...}
}
```
The options provided to `mpnet` are the same as the previously supported `bert` configuration.
This improves reporting of trained model size in the response of the stats API.
In particular, it removes the `model_size_bytes` from the `deployment_stats` section and
replaces it with a top-level `model_size_stats` object that contains:
- `model_size_bytes`: the actual model size
- `required_native_memory_bytes`: the amount of memory required to load a model
In addition, these are now reported for PyTorch models regardless of their deployment state.
