Improve tutorial (#355)

examples/python/phi-3-tutorial.md

@@ -26,25 +26,40 @@ These model repositories have models that run with DirectML, CPU and CUDA.
 
 ## Install the generate() API package
 
+**Unsure about which installation instructions to follow?** Here's a bit more guidance:
+
+Are you on Windows machine with GPU?
+* I don't know → Review [this guide](https://www.microsoft.com/en-us/windows/learning-center/how-to-check-gpu) to see whether you have a GPU in your Windows machine.
+* Yes → Follow the instructions for [DirectML](#directml).
+* No → Do you have an NVIDIA GPU?
+  * I don't know → Review [this guide](https://docs.nvidia.com/cuda/cuda-installation-guide-microsoft-windows/index.html#verify-you-have-a-cuda-capable-gpu) to see whether you have a CUDA-capable GPU.
+  * Yes → Follow the instructions for [NVIDIA CUDA GPU](#nvidia-cuda-gpu).
+  * No → Follow the instructions for [CPU](#cpu).
+
+*Note: Only one package is required based on your hardware.*
+
 ### DirectML
 
+
 ```
 pip install numpy
 pip install --pre onnxruntime-genai-directml
 ```
 
-### CPU
+### NVIDIA CUDA GPU
+
 
 ```
 pip install numpy
-pip install --pre onnxruntime-genai
+pip install --pre onnxruntime-genai-cuda --index-url=https://aiinfra.pkgs.visualstudio.com/PublicPackages/_packaging/onnxruntime-genai/pypi/simple/
 ```
 
-### CUDA
+### CPU
+
 
 ```
 pip install numpy
-pip install --pre onnxruntime-genai-cuda --index-url=https://aiinfra.pkgs.visualstudio.com/PublicPackages/_packaging/onnxruntime-genai/pypi/simple/
+pip install --pre onnxruntime-genai
 ```
 
 ## Run the model
@@ -55,6 +70,9 @@ The script accepts a model folder and takes the generation parameters from the c
 
 This example is using the long context model running with DirectML on Windows.
 
+The `-m` argument is the path to the model you downloaded from HuggingFace above.
+The `-l` argument is the length of output you would like to generate with the model.
+
 ```bash
 curl https://raw.githubusercontent.com/microsoft/onnxruntime-genai/main/examples/python/model-qa.py -o model-qa.py
 python model-qa.py -m Phi-3-mini-128k-instruct-onnx/directml/directml-int4-awq-block-128 -l 2048
@@ -66,4 +84,4 @@ Once the script has loaded the model, it will ask you for input in a loop, strea
 Input: <|user|>Tell me a joke about creative writing<|end|><|assistant|>
 
 Output:  Why don't writers ever get lost? Because they always follow the plot! 
-```
+```