Arm backend: Add DeepSeek-R1-Distill-Qwen layer tests

backends/arm/MODELS.md

@@ -5,6 +5,7 @@
 - Conformer
 - Deep AutoEncoder
 - Deit Tiny
+- DeepSeek-R1-Distill-Qwen-1.5B
 - DeepLab v3 (DL3)
 - DS CNN
 - Inception v3 (IC3)

backends/arm/test/models/DeepSeek_R1_Distill_Qwen/deepseek_r1_distill_qwen_test_config.py

@@ -0,0 +1,37 @@
+# Copyright 2026 Arm Limited and/or its affiliates.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+from transformers.models.qwen2.configuration_qwen2 import Qwen2Config
+
+
+def get_deepseek_r1_distill_qwen_1_5b_checkpoint_config() -> Qwen2Config:
+    return Qwen2Config(
+        architectures=["Qwen2ForCausalLM"],
+        attention_dropout=0.0,
+        bos_token_id=151643,
+        eos_token_id=151643,
+        hidden_act="silu",
+        hidden_size=1536,
+        initializer_range=0.02,
+        intermediate_size=8960,
+        max_position_embeddings=131072,
+        max_window_layers=21,
+        num_attention_heads=12,
+        num_hidden_layers=28,
+        num_key_value_heads=2,
+        rms_norm_eps=1e-6,  # type: ignore[arg-type]
+        rope_parameters={
+            "rope_type": "default",
+            "rope_theta": 10000.0,
+        },
+        sliding_window=4096,
+        tie_word_embeddings=False,
+        torch_dtype="bfloat16",
+        transformers_version="4.44.0",
+        use_cache=True,
+        use_mrope=False,
+        use_sliding_window=False,
+        vocab_size=151936,
+    )