Update tensor_server.py

tensor_server.py

@@ -1,321 +1,383 @@
-import os
-import json
-import torch
-import psutil
-import asyncio
-from datetime import datetime
-from typing import Dict, List, Optional
-from fastapi import FastAPI, HTTPException
-from pydantic import BaseModel
-import uvicorn
-import numpy as np
-
-# ===== Config =====
-class Settings:
-    # Server configuration
-    HOST = "0.0.0.0"  # Listen on all interfaces
-    PORT = 8001
-    SERVER_ID = os.getenv("SERVER_ID", "tensor1")  # Unique ID for this tensor server
-    
-    # The IP or hostname where this tensor server is accessible
-    PUBLIC_URL = os.getenv("PUBLIC_URL", f"http://192.168.1.101:8001")
-    
-    # URLs for other services (should be actual IP addresses or hostnames)
-    CONTROLLER_URL = os.getenv("CONTROLLER_URL", "http://192.168.1.100:8000")
-    AGGREGATOR_URL = os.getenv("AGGREGATOR_URL", "http://192.168.1.104:8002")
-    
-    # Model settings
-    DEVICE = "cuda" if torch.cuda.is_available() else "cpu"
-    MAX_BATCH_SIZE = 32
-    METRICS_UPDATE_INTERVAL = 5  # seconds
-    MODEL_DIR = "model_chunks"
-    
-    @classmethod
-    def from_env(cls):
-        """Load settings from environment variables"""
-        cls.HOST = os.getenv("TENSOR_HOST", cls.HOST)
-        cls.PORT = int(os.getenv("TENSOR_PORT", cls.PORT))
-        cls.SERVER_ID = os.getenv("SERVER_ID", cls.SERVER_ID)
-        cls.CONTROLLER_URL = os.getenv("CONTROLLER_URL", cls.CONTROLLER_URL)
-        cls.AGGREGATOR_URL = os.getenv("AGGREGATOR_URL", cls.AGGREGATOR_URL)
-        return cls
-
-# ===== Models =====
-class ModelChunk(BaseModel):
-    """Represents a received model chunk configuration"""
-    chunk_id: int
-    files: List[str]
-    config: Dict
-    
-class InferenceRequest(BaseModel):
-    """Represents an inference request"""
-    inputs: List[List[float]]
-    batch_size: Optional[int] = None
-
-class MetricsData(BaseModel):
-    """Server metrics data"""
-    cpu_usage: float
-    memory_usage: float
-    gpu_usage: Optional[float]
-    active_requests: int
-    total_requests: int
-    average_response_time: float
-    last_error: Optional[str]
-    error_count: int
-
-# ===== FastAPI App =====
-app = FastAPI(
-    title="Tensor Server",
-    description="Handles model chunk computations",
-    version="1.0.0"
-)
-
-# ===== State =====
-class ServerState:
-    def __init__(self):
-        self.loaded_chunks: Dict[int, torch.nn.Module] = {}
-        self.active_requests: int = 0
-        self.total_requests: int = 0
-        self.request_times: List[float] = []
-        self.error_count: int = 0
-        self.last_error: Optional[str] = None
-        self.is_computing: bool = False
-        
-state = ServerState()
-
-# ===== Metrics Collection =====
-async def collect_metrics() -> MetricsData:
-    """Collect current server metrics"""
-    # CPU and memory metrics
-    cpu_usage = psutil.cpu_percent()
-    memory = psutil.virtual_memory()
-    memory_usage = memory.percent
-    
-    # GPU metrics if available
-    gpu_usage = None
-    if torch.cuda.is_available():
-        try:
-            gpu_usage = torch.cuda.memory_allocated() / torch.cuda.max_memory_allocated() * 100
-        except:
-            pass
-    
-    # Calculate average response time
-    avg_response_time = sum(state.request_times) / len(state.request_times) if state.request_times else 0
-    
-    return MetricsData(
-        cpu_usage=cpu_usage,
-        memory_usage=memory_usage,
-        gpu_usage=gpu_usage,
-        active_requests=state.active_requests,
-        total_requests=state.total_requests,
-        average_response_time=avg_response_time,
-        last_error=state.last_error,
-        error_count=state.error_count
-    )
-
-async def update_metrics_loop():
-    """Background task to update metrics periodically"""
-    while True:
-        try:
-            metrics = await collect_metrics()
-            # Store metrics for health checks
-            state.current_metrics = metrics
-        except Exception as e:
-            print(f"[ERROR] Failed to update metrics: {str(e)}")
-        await asyncio.sleep(Settings.METRICS_UPDATE_INTERVAL)
-
-# ===== Helper Functions =====
-def load_chunk(chunk: ModelChunk) -> torch.nn.Module:
-    """Load a model chunk into memory"""
-    try:
-        # Create chunk directory if it doesn't exist
-        os.makedirs(Settings.MODEL_DIR, exist_ok=True)
-        
-        # Get chunk configuration
-        chunk_config = chunk.config
-        if "original_file" not in chunk_config:
-            raise ValueError("Missing original_file in chunk configuration")
-            
-        # Save chunk data to file
-        chunk_file = os.path.join(Settings.MODEL_DIR, chunk.files[0])
-        if not os.path.exists(chunk_file):
-            # We'll need to receive the actual chunk data in a separate request
-            raise ValueError(f"Chunk file not found: {chunk_file}")
-            
-        # For raw binary chunks, we'll create a simple buffer module
-        class ChunkBuffer(torch.nn.Module):
-            def __init__(self, chunk_path: str, config: Dict):
-                super().__init__()
-                self.chunk_path = chunk_path
-                self.config = config
-                self.start_offset = config.get('start_offset', 0)
-                self.size = config.get('size_bytes', 0)
-                
-            def forward(self, x: torch.Tensor) -> torch.Tensor:
-                # In a real implementation, this would process the input
-                # using the chunk data. For now, we'll just return the input
-                # as this is just for testing the distribution system
-                return x
-                
-        # Create and return the chunk buffer
-        chunk_model = ChunkBuffer(chunk_file, chunk_config)
-        print(f"[INFO] Loaded chunk {chunk.chunk_id} ({chunk_config.get('size_bytes', 0)} bytes) from {chunk.files[0]}")
-        
-        return chunk_model
-        
-    except Exception as e:
-        raise Exception(f"Failed to load chunk: {str(e)}")
-
-async def process_tensor(chunk_id: int, inputs: torch.Tensor) -> torch.Tensor:
-    """Process input tensor through the specified chunk"""
-    if chunk_id not in state.loaded_chunks:
-        raise HTTPException(status_code=400, detail=f"Chunk {chunk_id} not loaded")
-        
-    chunk_model = state.loaded_chunks[chunk_id]
-    with torch.no_grad():
-        outputs = chunk_model(inputs)
-    return outputs
-
-# ===== API Endpoints =====
-@app.get("/health")
-async def health_check():
-    """Health check endpoint"""
-    metrics = await collect_metrics()
-    return {
-        "status": "healthy",
-        "device": Settings.DEVICE,
-        "loaded_chunks": list(state.loaded_chunks.keys()),
-        "metrics": metrics.dict()
-    }
-
-@app.get("/metrics")
-async def get_metrics():
-    """Get current server metrics"""
-    return await collect_metrics()
-
-from fastapi import File, UploadFile
-
-@app.post("/load_chunk")
-async def load_model_chunk(chunk: ModelChunk):
-    """Register a chunk configuration"""
-    try:
-        # Create model directory if it doesn't exist
-        os.makedirs(Settings.MODEL_DIR, exist_ok=True)
-        
-        # Store the chunk metadata
-        chunk_file = os.path.join(Settings.MODEL_DIR, chunk.files[0])
-        state.chunk_configs = getattr(state, 'chunk_configs', {})
-        state.chunk_configs[chunk.chunk_id] = chunk
-        
-        print(f"[INFO] Registered chunk {chunk.chunk_id} configuration")
-        print(f"[INFO] Waiting for chunk data: {chunk.files[0]}")
-        
-        return {
-            "status": "configured",
-            "chunk_id": chunk.chunk_id,
-            "ready_for_data": True
-        }
-        
-    except Exception as e:
-        state.error_count += 1
-        state.last_error = str(e)
-        raise HTTPException(status_code=500, detail=str(e))
-
-@app.post("/upload_chunk_data/{chunk_id}")
-async def upload_chunk_data(chunk_id: int, file: UploadFile = File(...)):
-    """Receive the actual chunk data"""
-    try:
-        if chunk_id not in getattr(state, 'chunk_configs', {}):
-            raise HTTPException(status_code=400, detail="Chunk configuration not registered")
-            
-        chunk = state.chunk_configs[chunk_id]
-        chunk_file = os.path.join(Settings.MODEL_DIR, chunk.files[0])
-        
-        # Save the uploaded file
-        with open(chunk_file, 'wb') as f:
-            content = await file.read()
-            f.write(content)
-            
-        # Now load the chunk
-        chunk_model = load_chunk(chunk)
-        state.loaded_chunks[chunk_id] = chunk_model
-        
-        file_size = os.path.getsize(chunk_file)
-        print(f"[INFO] Received and loaded chunk {chunk_id} data ({file_size} bytes)")
-        
-        return {
-            "status": "loaded",
-            "chunk_id": chunk_id,
-            "size_bytes": file_size,
-            "file": chunk.files[0]
-        }
-        
-    except Exception as e:
-        state.error_count += 1
-        state.last_error = str(e)
-        raise HTTPException(status_code=500, detail=str(e))
-
-@app.post("/compute/{chunk_id}")
-async def compute(chunk_id: int, request: InferenceRequest):
-    """Perform computation on inputs using specified chunk"""
-    try:
-        start_time = datetime.now()
-        state.active_requests += 1
-        state.total_requests += 1
-        
-        # Convert inputs to tensor
-        inputs = torch.tensor(request.inputs, dtype=torch.float32, device=Settings.DEVICE)
-        
-        # Split into batches if needed
-        batch_size = request.batch_size or Settings.MAX_BATCH_SIZE
-        if len(inputs) > batch_size:
-            batches = torch.split(inputs, batch_size)
-            outputs = []
-            for batch in batches:
-                batch_output = await process_tensor(chunk_id, batch)
-                outputs.append(batch_output)
-            output_tensor = torch.cat(outputs, dim=0)
-        else:
-            output_tensor = await process_tensor(chunk_id, inputs)
-        
-        # Convert output to list
-        output_list = output_tensor.cpu().numpy().tolist()
-        
-        # Update metrics
-        end_time = datetime.now()
-        processing_time = (end_time - start_time).total_seconds()
-        state.request_times.append(processing_time)
-        # Keep only last 100 request times
-        state.request_times = state.request_times[-100:]
-        
-        return {
-            "outputs": output_list,
-            "processing_time": processing_time
-        }
-        
-    except Exception as e:
-        state.error_count += 1
-        state.last_error = str(e)
-        raise HTTPException(status_code=500, detail=str(e))
-        
-    finally:
-        state.active_requests -= 1
-
-@app.on_event("startup")
-async def startup_event():
-    """Start background tasks"""
-    asyncio.create_task(update_metrics_loop())
-
-# ===== Main Execution =====
-if __name__ == "__main__":
-    port = int(os.getenv("PORT", 8001))  # Default to 8001 to avoid conflict with controller
-    print(f"[INFO] Starting tensor server on port {port}")
-    print(f"[INFO] Using device: {Settings.DEVICE}")
-    print(f"[INFO] API Documentation available at http://localhost:{port}/docs")
-    
-    uvicorn.run(
-        "tensor_server:app",
-        host="0.0.0.0",
-        port=port,
-        reload=False
+import os
+import json
+import torch
+import psutil
+import asyncio
+from datetime import datetime
+from typing import Dict, List, Optional
+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel
+import uvicorn
+import numpy as np
+
+# ===== Config =====
+class Settings:
+    # Server configuration
+    HOST = "0.0.0.0"  # Listen on all interfaces
+    PORT = 8001
+    SERVER_ID = os.getenv("SERVER_ID", "tensor1")  # Unique ID for this tensor server
+    
+    # The IP or hostname where this tensor server is accessible
+    PUBLIC_URL = os.getenv("PUBLIC_URL", f"http://192.168.1.101:8001")
+    
+    # URLs for other services (should be actual IP addresses or hostnames)
+    CONTROLLER_URL = os.getenv("CONTROLLER_URL", "http://192.168.1.100:8000")
+    AGGREGATOR_URL = os.getenv("AGGREGATOR_URL", "http://192.168.1.104:8002")
+    
+    # Model settings
+    DEVICE = "cuda" if torch.cuda.is_available() else "cpu"
+    MAX_BATCH_SIZE = 32
+    METRICS_UPDATE_INTERVAL = 5  # seconds
+    MODEL_DIR = "model_chunks"
+    
+    @classmethod
+    def from_env(cls):
+        """Load settings from environment variables"""
+        cls.HOST = os.getenv("TENSOR_HOST", cls.HOST)
+        cls.PORT = int(os.getenv("TENSOR_PORT", cls.PORT))
+        cls.SERVER_ID = os.getenv("SERVER_ID", cls.SERVER_ID)
+        cls.CONTROLLER_URL = os.getenv("CONTROLLER_URL", cls.CONTROLLER_URL)
+        cls.AGGREGATOR_URL = os.getenv("AGGREGATOR_URL", cls.AGGREGATOR_URL)
+        return cls
+
+# ===== Models =====
+class ModelChunk(BaseModel):
+    """Represents a received model chunk configuration"""
+    chunk_id: int
+    files: List[str]
+    config: Dict
+    
+class InferenceRequest(BaseModel):
+    """Represents an inference request"""
+    inputs: List[List[float]]
+    batch_size: Optional[int] = None
+    top_k: Optional[int] = 5
+
+class MetricsData(BaseModel):
+    """Server metrics data"""
+    cpu_usage: float
+    memory_usage: float
+    gpu_usage: Optional[float]
+    active_requests: int
+    total_requests: int
+    average_response_time: float
+    last_error: Optional[str]
+    error_count: int
+
+# ===== FastAPI App =====
+app = FastAPI(
+    title="Tensor Server",
+    description="Handles model chunk computations",
+    version="1.0.0"
+)
+
+# ===== State =====
+class ServerState:
+    def __init__(self):
+        self.loaded_chunks: Dict[int, torch.nn.Module] = {}
+        self.active_requests: int = 0
+        self.total_requests: int = 0
+        self.request_times: List[float] = []
+        self.error_count: int = 0
+        self.last_error: Optional[str] = None
+        self.is_computing: bool = False
+        
+state = ServerState()
+
+# ===== Metrics Collection =====
+async def collect_metrics() -> MetricsData:
+    """Collect current server metrics"""
+    # CPU and memory metrics
+    cpu_usage = psutil.cpu_percent()
+    memory = psutil.virtual_memory()
+    memory_usage = memory.percent
+    
+    # GPU metrics if available
+    gpu_usage = None
+    if torch.cuda.is_available():
+        try:
+            gpu_usage = torch.cuda.memory_allocated() / torch.cuda.max_memory_allocated() * 100
+        except:
+            pass
+    
+    # Calculate average response time
+    avg_response_time = sum(state.request_times) / len(state.request_times) if state.request_times else 0
+    
+    return MetricsData(
+        cpu_usage=cpu_usage,
+        memory_usage=memory_usage,
+        gpu_usage=gpu_usage,
+        active_requests=state.active_requests,
+        total_requests=state.total_requests,
+        average_response_time=avg_response_time,
+        last_error=state.last_error,
+        error_count=state.error_count
+    )
+
+async def update_metrics_loop():
+    """Background task to update metrics periodically"""
+    while True:
+        try:
+            metrics = await collect_metrics()
+            # Store metrics for health checks
+            state.current_metrics = metrics
+        except Exception as e:
+            print(f"[ERROR] Failed to update metrics: {str(e)}")
+        await asyncio.sleep(Settings.METRICS_UPDATE_INTERVAL)
+
+# ===== Helper Functions =====
+def load_chunk(chunk: ModelChunk) -> torch.nn.Module:
+    """Load a model chunk into memory"""
+    try:
+        # Create chunk directory if it doesn't exist
+        os.makedirs(Settings.MODEL_DIR, exist_ok=True)
+        
+        # Get chunk configuration
+        chunk_config = chunk.config
+        if "original_file" not in chunk_config:
+            raise ValueError("Missing original_file in chunk configuration")
+            
+        # Save chunk data to file
+        chunk_file = os.path.join(Settings.MODEL_DIR, chunk.files[0])
+        if not os.path.exists(chunk_file):
+            # We'll need to receive the actual chunk data in a separate request
+            raise ValueError(f"Chunk file not found: {chunk_file}")
+            
+        # For raw binary chunks, we'll create a simple buffer module
+        class ChunkBuffer(torch.nn.Module):
+            def __init__(self, chunk_path: str, config: Dict):
+                super().__init__()
+                self.chunk_path = chunk_path
+                self.config = config
+                self.start_offset = config.get('start_offset', 0)
+                self.size = config.get('size_bytes', 0)
+                
+            def forward(self, x: torch.Tensor) -> torch.Tensor:
+                # In a real implementation, this would process the input
+                # using the chunk data. For now, we'll just return the input
+                # as this is just for testing the distribution system
+                return x
+                
+        # Create and return the chunk buffer
+        chunk_model = ChunkBuffer(chunk_file, chunk_config)
+        print(f"[INFO] Loaded chunk {chunk.chunk_id} ({chunk_config.get('size_bytes', 0)} bytes) from {chunk.files[0]}")
+        
+        return chunk_model
+        
+    except Exception as e:
+        raise Exception(f"Failed to load chunk: {str(e)}")
+
+async def process_tensor(chunk_id: int, inputs: torch.Tensor) -> torch.Tensor:
+    """Process input tensor through the specified chunk"""
+    if chunk_id not in state.loaded_chunks:
+        raise HTTPException(status_code=400, detail=f"Chunk {chunk_id} not loaded")
+        
+    chunk_model = state.loaded_chunks[chunk_id]
+    with torch.no_grad():
+        outputs = chunk_model(inputs)
+    return outputs
+
+# ===== API Endpoints =====
+@app.get("/health")
+async def health_check():
+    """Health check endpoint"""
+    metrics = await collect_metrics()
+    return {
+        "status": "healthy",
+        "device": Settings.DEVICE,
+        "loaded_chunks": list(state.loaded_chunks.keys()),
+        "metrics": metrics.dict()
+    }
+
+@app.get("/metrics")
+async def get_metrics():
+    """Get current server metrics"""
+    return await collect_metrics()
+
+from fastapi import File, UploadFile
+
+@app.post("/load_chunk")
+async def load_model_chunk(chunk: ModelChunk):
+    """Register a chunk configuration"""
+    try:
+        # Create model directory if it doesn't exist
+        os.makedirs(Settings.MODEL_DIR, exist_ok=True)
+        
+        # Store the chunk metadata
+        chunk_file = os.path.join(Settings.MODEL_DIR, chunk.files[0])
+        state.chunk_configs = getattr(state, 'chunk_configs', {})
+        state.chunk_configs[chunk.chunk_id] = chunk
+        
+        print(f"[INFO] Registered chunk {chunk.chunk_id} configuration")
+        print(f"[INFO] Waiting for chunk data: {chunk.files[0]}")
+        
+        return {
+            "status": "configured",
+            "chunk_id": chunk.chunk_id,
+            "ready_for_data": True
+        }
+        
+    except Exception as e:
+        state.error_count += 1
+        state.last_error = str(e)
+        raise HTTPException(status_code=500, detail=str(e))
+
+@app.post("/upload_chunk_data/{chunk_id}")
+async def upload_chunk_data(chunk_id: int, file: UploadFile = File(...)):
+    """Receive the actual chunk data"""
+    try:
+        if chunk_id not in getattr(state, 'chunk_configs', {}):
+            raise HTTPException(status_code=400, detail="Chunk configuration not registered")
+            
+        chunk = state.chunk_configs[chunk_id]
+        chunk_file = os.path.join(Settings.MODEL_DIR, chunk.files[0])
+        
+        # Save the uploaded file
+        with open(chunk_file, 'wb') as f:
+            content = await file.read()
+            f.write(content)
+            
+        # Now load the chunk
+        chunk_model = load_chunk(chunk)
+        state.loaded_chunks[chunk_id] = chunk_model
+        
+        file_size = os.path.getsize(chunk_file)
+        print(f"[INFO] Received and loaded chunk {chunk_id} data ({file_size} bytes)")
+        
+        return {
+            "status": "loaded",
+            "chunk_id": chunk_id,
+            "size_bytes": file_size,
+            "file": chunk.files[0]
+        }
+        
+    except Exception as e:
+        state.error_count += 1
+        state.last_error = str(e)
+        raise HTTPException(status_code=500, detail=str(e))
+
+@app.post("/compute/{chunk_id}")
+async def compute(chunk_id: int, request: InferenceRequest):
+    """Perform computation on inputs using specified chunk"""
+    try:
+        start_time = datetime.now()
+        state.active_requests += 1
+        state.total_requests += 1
+        
+        # Convert inputs to tensor
+        inputs = torch.tensor(request.inputs, dtype=torch.float32, device=Settings.DEVICE)
+        
+        # Split into batches if needed
+        batch_size = request.batch_size or Settings.MAX_BATCH_SIZE
+        if len(inputs) > batch_size:
+            batches = torch.split(inputs, batch_size)
+            outputs = []
+            for batch in batches:
+                batch_output = await process_tensor(chunk_id, batch)
+                outputs.append(batch_output)
+            output_tensor = torch.cat(outputs, dim=0)
+        else:
+            output_tensor = await process_tensor(chunk_id, inputs)
+        
+        # Convert output to numpy for diagnostics
+        try:
+            shard_np = output_tensor.cpu().numpy()
+        except Exception:
+            shard_np = None
+
+        chunk_details = {}
+        try:
+            # Normalize to 2D: (seq_len, shard_dim)
+            if shard_np is None:
+                raise ValueError("Unable to convert output tensor to numpy")
+
+            seq_len = shard_np.shape[0]
+            shard_2d = shard_np.reshape(seq_len, -1)
+
+            k = int(request.top_k or 5)
+            k = min(k, shard_2d.shape[1]) if shard_2d.shape[1] > 0 else 0
+
+            # compute local top-k per position
+            if k > 0:
+                topk_idx = np.argpartition(-shard_2d, k-1, axis=1)[:, :k]
+                topk_vals = np.take_along_axis(shard_2d, topk_idx, axis=1)
+            else:
+                topk_idx = np.zeros((seq_len, 0), dtype=int)
+                topk_vals = np.zeros((seq_len, 0), dtype=float)
+
+            # determine vocab_offset from the loaded chunk config if available
+            cfg = None
+            try:
+                chunk_model = state.loaded_chunks.get(chunk_id)
+                cfg = getattr(chunk_model, 'config', None) or getattr(state, 'chunk_configs', {}).get(chunk_id, {}).config if chunk_id in getattr(state, 'chunk_configs', {}) else None
+            except Exception:
+                cfg = None
+
+            vocab_offset = 0
+            if isinstance(cfg, dict):
+                vocab_offset = int(cfg.get('vocab_offset', 0))
+            elif cfg is not None and hasattr(cfg, 'get'):
+                vocab_offset = int(cfg.get('vocab_offset', 0))
+
+            per_position_topk = []
+            for pos_idx in range(seq_len):
+                toks = []
+                for jj in range(topk_idx.shape[1]):
+                    local_idx = int(topk_idx[pos_idx, jj])
+                    token_id = int(vocab_offset + local_idx)
+                    score = float(topk_vals[pos_idx, jj])
+                    toks.append([token_id, score])
+                per_position_topk.append(toks)
+
+            chunk_details[chunk_id] = {
+                'logits_shard': shard_2d.tolist(),
+                'topk': per_position_topk,
+                'vocab_offset': vocab_offset,
+                'shard_dim': shard_2d.shape[1]
+            }
+        except Exception as e:
+            # If diagnostics fail, include error info but keep main outputs
+            chunk_details = {chunk_id: {'error': str(e)}}
+
+        # Convert output to list for backward compatibility
+        output_list = output_tensor.cpu().numpy().tolist()
+
+        # Update metrics
+        end_time = datetime.now()
+        processing_time = (end_time - start_time).total_seconds()
+        state.request_times.append(processing_time)
+        # Keep only last 100 request times
+        state.request_times = state.request_times[-100:]
+
+        return {
+            "outputs": output_list,
+            "processing_time": processing_time,
+            "chunk_details": chunk_details
+        }
+        
+    except Exception as e:
+        state.error_count += 1
+        state.last_error = str(e)
+        raise HTTPException(status_code=500, detail=str(e))
+        
+    finally:
+        state.active_requests -= 1
+
+@app.on_event("startup")
+async def startup_event():
+    """Start background tasks"""
+    asyncio.create_task(update_metrics_loop())
+
+# ===== Main Execution =====
+if __name__ == "__main__":
+    port = int(os.getenv("PORT", 8001))  # Default to 8001 to avoid conflict with controller
+    print(f"[INFO] Starting tensor server on port {port}")
+    print(f"[INFO] Using device: {Settings.DEVICE}")
+    print(f"[INFO] API Documentation available at http://localhost:{port}/docs")
+    
+    uvicorn.run(
+        "tensor_server:app",
+        host="0.0.0.0",
+        port=port,
+        reload=False
     )