bump alibi-detect to 0.8.1 in adserver (#3871)

* bump alibi-detect to 0.8.1 in adserver

* set numba cache directory such that it is writable

* use tensorflow 2.7.0 for alibi detect server

* make mypy happy

components/alibi-detect-server/Dockerfile

@@ -70,4 +70,7 @@ COPY --from=builder /opt/conda /opt/conda
 COPY --from=builder /usr/bin/rclone /usr/bin/rclone
 COPY --from=builder /licenses /licenses
 
+# This is to have writable numba cache directory
+ENV NUMBA_CACHE_DIR /tmp/numba-cache
+
 ENTRYPOINT ["python", "-m", "adserver"]

components/alibi-detect-server/adserver/cd_model.py

@@ -1,5 +1,5 @@
 import json
-from typing import List, Dict, Optional, Union
+from typing import List, Dict, Optional, Union, cast
 import logging
 import numpy as np
 from .numpy_encoder import NumpyEncoder
@@ -52,7 +52,7 @@ def __init__(
         """
         super().__init__(name, storage_uri, model)
         self.drift_batch_size = drift_batch_size
-        self.batch: np.array = None
+        self.batch: Optional[np.ndarray] = None
         self.model: Data = model
 
     def process_event(self, inputs: Union[List, Dict], headers: Dict) -> Optional[ModelResponse]:
@@ -86,6 +86,8 @@ def process_event(self, inputs: Union[List, Dict], headers: Dict) -> Optional[Mo
         else:
             self.batch = np.concatenate((self.batch, X))
 
+        self.batch = cast(np.ndarray, self.batch)
+
         if self.batch.shape[0] >= self.drift_batch_size:
             logging.info(
                 "Running drift detection. Batch size is %d. Needed %d",

components/alibi-detect-server/adserver/protocols/seldon_http.py

@@ -35,7 +35,7 @@ def _extract_list(body: Dict) -> List:
         raise Exception("Unknown Seldon payload %s" % body)
 
 
-def _create_seldon_data_def(array: np.array, ty: SeldonPayload):
+def _create_seldon_data_def(array: np.ndarray, ty: SeldonPayload):
     datadef = {}
     if ty == SeldonPayload.TENSOR:
         datadef["tensor"] = {"shape": array.shape, "values": array.ravel().tolist()}

components/alibi-detect-server/adserver/protocols/v2.py

@@ -1,5 +1,5 @@
 from http import HTTPStatus
-from typing import Dict, List
+from typing import Dict, List, Any
 
 import numpy as np
 import tornado
@@ -8,10 +8,9 @@
 )  # pylint: disable=no-name-in-module
 
 
-def _create_np_from_v2(data: list, ty: str, shape: list) -> np.array:
-    npty = np.float
+def _create_np_from_v2(data: list, ty: str, shape: list) -> np.ndarray:
     if ty == "BOOL":
-        npty = np.bool
+        npty: Any = bool
     elif ty == "UINT8":
         npty = np.uint8
     elif ty == "UINT16":