Disable Layer Fusion in OpenVINO

[Rah00m]

✨ Feature: Disable Layer Fusion (via Config or Env Var)

This PR adds the ability to disable CPU layer fusion in OpenVINO via a runtime config or environment variable, enabling:

• 🔍 Detailed profiling
• 🧪 Layer-level debugging
• 📊 Transparent runtime graphs

---

✅ What's Added

• 🔑 New runtime config key: DISABLE_LAYER_FUSION
• 🌍 Environment variable support: DISABLE_LAYER_FUSION
• 🧪 Test script: test_disable_fusion.py to validate behavior
• 🧠 Integrated with CPU Plugin via Config::applyDebugCapsProperties()
• 🔍 Runtime graph inspection to check fused vs. unfused ops

---

🎯 Why Disable Layer Fusion?

Disabling layer fusion is useful for:

• 🔍 Profiling individual layers (e.g., ReLU, HSwish, Pooling)
• 🧪 Debugging fused ops that hide intermediate computations
• 📊 Generating detailed performance reports (e.g., benchmark_detailed_counters_report.csv)

---

✅ Option 1 – Runtime Config (Recommended)

from openvino.runtime import Core

core = Core()
core.set_property("DISABLE_LAYER_FUSION", "YES")  # Must be set before compile_model()
model = core.read_model("model.xml")
compiled_model = core.compile_model(model, "CPU")

✅ This guarantees fusion is disabled before model compilation.

---

⚠️ Option 2 – Environment Variable (Experimental)

⚠️ In some builds, the environment variable may not take effect due to being read after plugin initialization.

Windows (CMD):

set DISABLE_LAYER_FUSION=YES
python test_disable_fusion.py

Linux/macOS (Bash):

export DISABLE_LAYER_FUSION=YES
python test_disable_fusion.py

---

📄 More details: See docs/disable_layer_fusion_doc.md

[Rah00m]

Hi! I've finished implementing the patch to allow disabling layer fusion via environment variable or config.
Please let me know if there are any changes or improvements needed — happy to adjust! Looking forward to your review. 😊

[itikhono]

debug?