Fix run info memleaks (#412)

* [add] added mobilenet model use case to quickly check for leaks on modelruns with large tensors (dagrun and modelrun variations)

* Fix run info memleaks

* [fix] fixed reference count on ai.dagrun and ai.dagrunro for tensor structure. Added AI_dictType AI_dictTypeTensorVals with proper valDestructor

* [fix] removed WIP unit test folder (not for this issue)

Co-authored-by: filipecosta90 <filipecosta.90@gmail.com>

Author: lantiga

src/dag.c

@@ -91,6 +91,16 @@ void *RedisAI_DagRunSession(RedisAI_RunInfo *rinfo) {
               currentOp->result = REDISMODULE_ERR;
             }
           }
+          // since we've increased the reference count prior modelrun we need to decrease it
+          const size_t ninputs = RAI_ModelRunCtxNumInputs(currentOp->mctx);
+          for (size_t inputNumber = 0; inputNumber < ninputs; inputNumber++) {
+            RAI_Tensor *tensor =
+                RAI_ModelRunCtxInputTensor(currentOp->mctx, inputNumber);
+            if (tensor) {
+              RAI_TensorFree(tensor);
+            }
+          }
+
         } else {
           currentOp->result = REDISMODULE_ERR;
         }
@@ -243,7 +253,6 @@ int RedisAI_DagRun_Reply(RedisModuleCtx *ctx, RedisModuleString **argv,
       }
       RedisModule_CloseKey(key);
       RedisAI_ReplicateTensorSet(ctx, tensor_keyname, tensor);
-      // TODO: free Tensor
     } else {
       RedisModule_ReplyWithError(
           ctx, "ERR specified persistent key that was not used on DAG");

src/model.c

@@ -424,17 +424,20 @@ RAI_Tensor* RAI_ModelRunCtxOutputTensor(RAI_ModelRunCtx* mctx, size_t index) {
   return mctx->outputs[index].tensor;
 }
 
-void RAI_ModelRunCtxFree(RAI_ModelRunCtx* mctx) {
-  for (size_t i=0; i<array_len(mctx->inputs); ++i) {
-    RAI_TensorFree(mctx->inputs[i].tensor);
-  }
-  array_free(mctx->inputs);
+void RAI_ModelRunCtxFree(RAI_ModelRunCtx* mctx, int freeTensors) {
+  if (freeTensors) {
+    for (size_t i=0; i<array_len(mctx->inputs); ++i) {
+      RAI_TensorFree(mctx->inputs[i].tensor);
+    }
 
-  for (size_t i = 0 ; i < array_len(mctx->outputs) ; ++i) {
-    if (mctx->outputs[i].tensor) {
-      RAI_TensorFree(mctx->outputs[i].tensor);
+    for (size_t i = 0 ; i < array_len(mctx->outputs) ; ++i) {
+      if (mctx->outputs[i].tensor) {
+        RAI_TensorFree(mctx->outputs[i].tensor);
+      }
     }
   }
+
+  array_free(mctx->inputs);
   array_free(mctx->outputs);
 
   RAI_Error err = {0};

src/model.h

@@ -79,8 +79,9 @@ RAI_ModelRunCtx* RAI_ModelRunCtxCreate(RAI_Model* model);
  * work
  *
  * @param mctx
+ * @param freeTensors free input and output tensors or leave them allocated
  */
-void RAI_ModelRunCtxFree(RAI_ModelRunCtx* mctx);
+void RAI_ModelRunCtxFree(RAI_ModelRunCtx* mctx, int freeTensors);
 
 /**
  * Allocates a RAI_ModelCtxParam data structure, and enforces a shallow copy of

src/run_info.c

@@ -16,6 +16,40 @@
 #include "util/arr_rm_alloc.h"
 #include "util/dict.h"
 
+
+static uint64_t RAI_TensorDictKeyHashFunction(const void *key){
+    return AI_dictGenHashFunction(key, strlen((char*)key));
+}
+
+static int RAI_TensorDictKeyStrcmp(void *privdata, const void *key1, const void *key2){
+    const char* strKey1 = key1;
+    const char* strKey2 = key2;
+    return strcmp(strKey1, strKey2) == 0;
+}
+
+static void RAI_TensorDictKeyFree(void *privdata, void *key){
+    RedisModule_Free(key);
+}
+
+static void* RAI_TensorDictKeyDup(void *privdata, const void *key){
+    return RedisModule_Strdup((char*)key);
+}
+
+static void RAI_TensorDictValFree(void *privdata, const void *obj){
+    return RAI_TensorFree((RAI_Tensor*)obj);
+}
+
+
+AI_dictType AI_dictTypeTensorVals = {
+        .hashFunction = RAI_TensorDictKeyHashFunction,
+        .keyDup = RAI_TensorDictKeyDup,
+        .valDup = NULL,
+        .keyCompare = RAI_TensorDictKeyStrcmp,
+        .keyDestructor = RAI_TensorDictKeyFree,
+        .valDestructor = RAI_TensorDictValFree,
+};
+
+
 /**
  * Allocate the memory and initialise the RAI_DagOp.
  * @param result Output parameter to capture allocated RAI_DagOp.
@@ -76,7 +110,7 @@ int RAI_InitRunInfo(RedisAI_RunInfo **result) {
     return REDISMODULE_ERR;
   }
   rinfo->use_local_context = 0;
-  rinfo->dagTensorsContext = AI_dictCreate(&AI_dictTypeHeapStrings, NULL);
+  rinfo->dagTensorsContext = AI_dictCreate(&AI_dictTypeTensorVals, NULL);
   if (!(rinfo->dagTensorsContext)) {
     return REDISMODULE_ERR;
   }
@@ -116,6 +150,13 @@ void RAI_FreeDagOp(RedisModuleCtx *ctx, RAI_DagOp *dagOp) {
     }
     array_free(dagOp->outTensors);
 
+    if (dagOp->mctx) {
+      RAI_ModelRunCtxFree(dagOp->mctx, false);
+    }
+    if (dagOp->sctx) {
+      RAI_ScriptRunCtxFree(dagOp->sctx, false);
+    }
+
     RedisModule_Free(dagOp);
   }
 }
@@ -125,37 +166,48 @@ void RAI_FreeRunInfo(RedisModuleCtx *ctx, struct RedisAI_RunInfo *rinfo) {
     return;
   }
   if (rinfo->mctx) {
-    RAI_ModelRunCtxFree(rinfo->mctx);
+    RAI_ModelRunCtxFree(rinfo->mctx, true);
   }
   if (rinfo->sctx) {
-    RAI_ScriptRunCtxFree(rinfo->sctx);
+    RAI_ScriptRunCtxFree(rinfo->sctx, true);
   }
   RAI_FreeError(rinfo->err);
 
   if (rinfo->dagTensorsContext) {
     AI_dictIterator *iter = AI_dictGetSafeIterator(rinfo->dagTensorsContext);
-    AI_dictEntry *stats_entry = AI_dictNext(iter);
+    AI_dictEntry *entry = AI_dictNext(iter);
     RAI_Tensor *tensor = NULL;
 
-    while (stats_entry) {
-      tensor = AI_dictGetVal(stats_entry);
-      char *key = (char *)AI_dictGetKey(stats_entry);
+    while (entry) {
+      tensor = AI_dictGetVal(entry);
+      char *key = (char *)AI_dictGetKey(entry);
 
-      if (tensor&&key!=NULL) {
+      if (tensor && key != NULL) {
         // if the key is persistent then we should not delete it
         AI_dictEntry *persistent_entry =
             AI_dictFind(rinfo->dagTensorsPersistentContext, key);
-        // if the key was loaded from the keyspace then we should not delete
-        // it
+        // if the key was loaded from the keyspace then we should not delete it
         AI_dictEntry *loaded_entry =
             AI_dictFind(rinfo->dagTensorsLoadedContext, key);
+
         if (persistent_entry == NULL && loaded_entry == NULL) {
-          RAI_TensorFree(tensor);
+          AI_dictDelete(rinfo->dagTensorsContext, key);
+        }
+
+        if (persistent_entry) {
+          AI_dictDelete(rinfo->dagTensorsPersistentContext, key);
+        }
+        if (loaded_entry) {
+          AI_dictDelete(rinfo->dagTensorsLoadedContext, key);
         }
       }
-      stats_entry = AI_dictNext(iter);
+      entry = AI_dictNext(iter);
     }
     AI_dictReleaseIterator(iter);
+
+    RedisModule_Free(rinfo->dagTensorsContext);
+    RedisModule_Free(rinfo->dagTensorsLoadedContext);
+    RedisModule_Free(rinfo->dagTensorsPersistentContext);
   }
 
   if (rinfo->dagOps) {

src/script.c

@@ -202,17 +202,20 @@ RAI_Tensor* RAI_ScriptRunCtxOutputTensor(RAI_ScriptRunCtx* sctx, size_t index) {
   return sctx->outputs[index].tensor;
 }
 
-void RAI_ScriptRunCtxFree(RAI_ScriptRunCtx* sctx) {
-  for (size_t i = 0; i < array_len(sctx->inputs); ++i) {
-    RAI_TensorFree(sctx->inputs[i].tensor);
-  }
-  array_free(sctx->inputs);
+void RAI_ScriptRunCtxFree(RAI_ScriptRunCtx* sctx, int freeTensors) {
+  if (freeTensors) {
+    for (size_t i = 0; i < array_len(sctx->inputs); ++i) {
+      RAI_TensorFree(sctx->inputs[i].tensor);
+    }
 
-  for (size_t i = 0; i < array_len(sctx->outputs); ++i) {
-    if (sctx->outputs[i].tensor) {
-      RAI_TensorFree(sctx->outputs[i].tensor);
+    for (size_t i = 0; i < array_len(sctx->outputs); ++i) {
+      if (sctx->outputs[i].tensor) {
+        RAI_TensorFree(sctx->outputs[i].tensor);
+      }
     }
   }
+
+  array_free(sctx->inputs);
   array_free(sctx->outputs);
 
   RedisModule_Free(sctx->fnname);

src/script.h

@@ -119,8 +119,9 @@ RAI_Tensor* RAI_ScriptRunCtxOutputTensor(RAI_ScriptRunCtx* sctx, size_t index);
  * work
  *
  * @param sctx
+ * @param freeTensors free input and output tensors or leave them allocated
  */
-void RAI_ScriptRunCtxFree(RAI_ScriptRunCtx* sctx);
+void RAI_ScriptRunCtxFree(RAI_ScriptRunCtx* sctx, int freeTensors);
 
 /**
  * Given the input script context, run associated script

test/includes.py

@@ -16,6 +16,7 @@
 except:
     pass
 
+MAX_ITERATIONS = 2 if os.environ.get("MAX_ITERATIONS") == None else os.environ.get("MAX_ITERATIONS")
 TEST_TF = os.environ.get("TEST_TF") != "0" and os.environ.get("WITH_TF") != "0"
 TEST_TFLITE = os.environ.get("TEST_TFLITE") != "0" and os.environ.get("WITH_TFLITE") != "0"
 TEST_PT = os.environ.get("TEST_PT") != "0" and os.environ.get("WITH_PT") != "0"
@@ -24,7 +25,7 @@
 DEVICE = os.environ.get('DEVICE', 'CPU').upper().encode('utf-8', 'ignore').decode('utf-8')
 VALGRIND = os.environ.get("VALGRIND") == "1"
 print(f"Running tests on {DEVICE}\n")
-
+print(f"Using a max of {MAX_ITERATIONS} iterations per test\n")
 # change this to make inference tests longer
 MAX_TRANSACTIONS=100
 
@@ -91,12 +92,35 @@ def load_resnet_test_data():
 
     return model_pb, script, labels, img
 
+def load_mobilenet_v1_test_data():
+    test_data_path = os.path.join(os.path.dirname(__file__), 'test_data')
+    labels_filename = os.path.join(test_data_path, 'imagenet_class_index.json')
+    image_filename = os.path.join(test_data_path, 'panda.jpg')
+    model_filename = os.path.join(test_data_path, 'mobilenet/mobilenet_v1_100_224_cpu_NxHxWxC.pb')
+    input_var = 'input'
+    output_var = 'MobilenetV1/Predictions/Reshape_1'
+
+    with open(model_filename, 'rb') as f:
+        model_pb = f.read()
+
+    with open(labels_filename, 'r') as f:
+        labels = json.load(f)
+
+    img_height, img_width = 224, 224
+
+    img = imread(image_filename)
+    img = resize(img, (img_height, img_width), mode='constant', anti_aliasing=True)
+    img = img.astype(np.float32)
+
+    return model_pb, input_var, output_var, labels, img
 
-def load_mobilenet_test_data():
+def load_mobilenet_v2_test_data():
     test_data_path = os.path.join(os.path.dirname(__file__), 'test_data')
     labels_filename = os.path.join(test_data_path, 'imagenet_class_index.json')
     image_filename = os.path.join(test_data_path, 'panda.jpg')
-    model_filename = os.path.join(test_data_path, 'mobilenet_v2_1.4_224_frozen.pb')
+    model_filename = os.path.join(test_data_path, 'mobilenet/mobilenet_v2_1.4_224_frozen.pb')
+    input_var = 'input'
+    output_var = 'MobilenetV2/Predictions/Reshape_1'
 
     with open(model_filename, 'rb') as f:
         model_pb = f.read()
@@ -110,7 +134,7 @@ def load_mobilenet_test_data():
     img = resize(img, (img_height, img_width), mode='constant', anti_aliasing=True)
     img = img.astype(np.float32)
 
-    return model_pb, labels, img
+    return model_pb, input_var, output_var, labels, img
 
 def load_creditcardfraud_data(env,max_tensors=10000):
     test_data_path = os.path.join(os.path.dirname(__file__), 'test_data')

test/test_data/mobilenet/mobilenet_v1_100_224_cpu_NxHxWxC.pb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:bbb2752038ff1749d2b55988bb5f6e999a799c19413a0691b82d29f7aec0bab3
+size 17198345

test/test_data/mobilenet/mobilenet_v1_100_224_gpu_NxHxWxC.pb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f1fe206dfd3cff261cf403b5757abec886da445a80056e55310ddac0b2805a3b
+size 17198345

test/test_data/mobilenet/mobilenet_v1_100_224_gpu_NxHxWxC_fp16_trt.pb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:fd925f4b59d8d5035ccb2ecdfbf9b0f47a5ba3acfa81bd5a18536f69021df74a
+size 34277746

test/test_data/mobilenet/mobilenet_v2_1.4_224_frozen.pb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:111479258f3841c93d0a7a377c976c24e8281077818991931429d2277dd88590
+size 24508794

test/test_data/mobilenet/model_saver.py

@@ -0,0 +1,49 @@
+import tensorflow as tf
+import tensorflow_hub as hub
+import ml2rt
+import argparse
+import sys
+
+url = 'https://tfhub.dev/google/imagenet/mobilenet_v1_100_224/quantops/classification/3'
+model_name = 'mobilenet_v1_100_224'
+module = hub.Module(url)
+batch_size = 1
+number_channels = 3
+height, width = hub.get_expected_image_size(module)
+input_var = 'input'
+output_var = 'MobilenetV1/Predictions/Reshape_1'
+
+parser = argparse.ArgumentParser()
+parser.add_argument('--gpu', action="store_true", default=False)
+parser.add_argument('--input-shape', default="NxHxWxC", type=str)
+args = parser.parse_args()
+device = 'gpu' if args.gpu else 'cpu'
+
+gpu_available = tf.test.is_gpu_available(
+    cuda_only=True, min_cuda_compute_capability=None
+)
+
+if gpu_available is False and args.gpu:
+    print("No CUDA GPUs found. Exiting...")
+    sys.exit(1)
+
+var_converter = tf.compat.v1.graph_util.convert_variables_to_constants
+
+if args.input_shape == "NxHxWxC":
+    print("Saving N x H x W x C (1, 224, 224, 3) (with channels_last data format)")
+    images = tf.compat.v1.placeholder(tf.float32, shape=(
+        batch_size, height, width, number_channels), name=input_var)
+elif args.input_shape == "NxHxWxC":
+    print("Saving N x C x H x W (1, 3, 224, 224)")
+    images = tf.placeholder(tf.float32, shape=(
+        batch_size, number_channels, height, width), name=input_var)
+else:
+    print("inputs shape is either NxHxWxC or NxCxHxW. Exiting...")
+    sys.exit(1)
+
+logits = module(images)
+logits = tf.identity(logits, output_var)
+with tf.compat.v1.Session() as sess:
+    sess.run([tf.compat.v1.global_variables_initializer()])
+    ml2rt.save_tensorflow(sess, '{model_name}_{device}_{input_shape}.pb'.format(
+        model_name=model_name, device=device, input_shape=args.input_shape), output=[output_var])