docs: add instruction to download Qwen2-1.5B model (#75)

* docs: add instruction to download Qwen2-1.5B model

Author: jinhuix

book/src/week1-05-qwen2-model.md

@@ -6,6 +6,7 @@ Before we start, please make sure you have downloaded the models:
 
 ```bash
 huggingface-cli download Qwen/Qwen2-0.5B-Instruct-MLX
+huggingface-cli download Qwen/Qwen2-1.5B-Instruct-MLX
 huggingface-cli download Qwen/Qwen2-7B-Instruct-MLX
 ```
 
@@ -47,6 +48,7 @@ You should pass all tests for this task by running:
 ```bash
 # Download the models if you haven't done so
 huggingface-cli download Qwen/Qwen2-0.5B-Instruct-MLX
+huggingface-cli download Qwen/Qwen2-1.5B-Instruct-MLX
 huggingface-cli download Qwen/Qwen2-7B-Instruct-MLX
 # Run the tests
 pdm run test --week 1 --day 5 -- -k task_1
@@ -88,6 +90,7 @@ You should pass all tests for this task by running:
 ```bash
 # Download the models if you haven't done so; we need to tokenizers
 huggingface-cli download Qwen/Qwen2-0.5B-Instruct-MLX
+huggingface-cli download Qwen/Qwen2-1.5B-Instruct-MLX
 huggingface-cli download Qwen/Qwen2-7B-Instruct-MLX
 # Run the tests
 pdm run test --week 1 --day 5 -- -k task_2
@@ -152,6 +155,7 @@ You should pass all tests for this task by running:
 ```bash
 # Download the models if you haven't done so
 huggingface-cli download Qwen/Qwen2-0.5B-Instruct-MLX
+huggingface-cli download Qwen/Qwen2-1.5B-Instruct-MLX
 huggingface-cli download Qwen/Qwen2-7B-Instruct-MLX
 # Run the tests
 pdm run test --week 1 --day 5 -- -k task_3

book/src/week1-06-generate-response.md

@@ -58,8 +58,15 @@ We will optimize the `decode` process to use key-value cache to speed up the gen
 You can test your implementation by running the following command:
 
 ```bash
+# Download the models if you haven't done so
+huggingface-cli download Qwen/Qwen2-0.5B-Instruct-MLX
+huggingface-cli download Qwen/Qwen2-1.5B-Instruct-MLX
+huggingface-cli download Qwen/Qwen2-7B-Instruct-MLX
+# Run the tests
 pdm run main --solution tiny_llm --loader week1 --model qwen2-0.5b \
   --prompt "Give me a short introduction to large language model"
+pdm run main --solution tiny_llm --loader week1 --model qwen2-1.5b \
+  --prompt "Give me a short introduction to large language model"
 pdm run main --solution tiny_llm --loader week1 --model qwen2-7b \
   --prompt "Give me a short introduction to large language model"
 ```