kv embedding inference test (#4373)

Summary:

X-link: facebookresearch/FBGEMM#1442



Rollback Plan:

Differential Revision: D76865305

Author: Chenyu Zhang

fbgemm_gpu/test/tbe/dram_kv/dram_kv_inference_test.py

@@ -0,0 +1,95 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+# pyre-strict
+
+from unittest import TestCase
+
+import torch
+from fbgemm_gpu.split_embedding_configs import SparseType
+from fbgemm_gpu.utils.loader import load_torch_module
+
+load_torch_module(
+    "//deeplearning/fbgemm/fbgemm_gpu:dram_kv_embedding_inference",
+)
+
+
+class DramKvInferenceTest(TestCase):
+    def test_serialize(self) -> None:
+        num_shards = 32
+        uniform_init_lower: float = -0.01
+        uniform_init_upper: float = 0.01
+        evict_trigger_mode: int = 1
+
+        kv_embedding_cache = torch.classes.fbgemm.DramKVEmbeddingInferenceWrapper(
+            num_shards, uniform_init_lower, uniform_init_upper, evict_trigger_mode
+        )
+        serialized_result = kv_embedding_cache.serialize()
+
+        self.assertEqual(serialized_result[0][0], num_shards)
+        self.assertEqual(serialized_result[0][1], evict_trigger_mode)
+
+        self.assertEqual(serialized_result[1][0], uniform_init_lower)
+        self.assertEqual(serialized_result[1][1], uniform_init_upper)
+
+    def test_serialize_deserialize(self) -> None:
+        num_shards = 32
+        uniform_init_lower: float = -0.01
+        uniform_init_upper: float = 0.01
+        evict_trigger_mode: int = 1
+
+        kv_embedding_cache = torch.classes.fbgemm.DramKVEmbeddingInferenceWrapper(
+            num_shards, uniform_init_lower, uniform_init_upper, evict_trigger_mode
+        )
+        serialized_result = kv_embedding_cache.serialize()
+
+        kv_embedding_cache_2 = torch.classes.fbgemm.DramKVEmbeddingInferenceWrapper(
+            0, 0.0, 0.0, 0
+        )
+        kv_embedding_cache_2.deserialize(serialized_result)
+
+        self.assertEqual(str(serialized_result), str(kv_embedding_cache_2.serialize()))
+
+    def test_set_get_embeddings(self) -> None:
+        num_shards = 32
+        uniform_init_lower: float = 0.0
+        uniform_init_upper: float = 0.0
+        evict_trigger_mode: int = 0
+
+        kv_embedding_cache = torch.classes.fbgemm.DramKVEmbeddingInferenceWrapper(
+            num_shards, uniform_init_lower, uniform_init_upper, evict_trigger_mode
+        )
+        kv_embedding_cache.init(
+            [(20, 4, SparseType.INT8.as_int())],
+            8,
+            4,
+        )
+
+        kv_embedding_cache.set_embeddings(
+            torch.tensor([0, 1, 2, 3], dtype=torch.int64),
+            torch.tensor(
+                [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 16]],
+                dtype=torch.uint8,
+            ),
+        )
+
+        embs = kv_embedding_cache.get_embeddings(
+            torch.tensor([1, 4, 3, 0, 5, 2], dtype=torch.int64),
+        )
+        assert torch.equal(
+            embs[:, :4],
+            torch.tensor(
+                [
+                    [5, 6, 7, 8],
+                    [0, 0, 0, 0],
+                    [13, 14, 15, 16],
+                    [1, 2, 3, 4],
+                    [0, 0, 0, 0],
+                    [9, 10, 11, 12],
+                ],
+                dtype=torch.uint8,
+            ),
+        )