Settable confidence thresholds

.gitignore

@@ -16,3 +16,4 @@ opencv/
 *.onnx
 convert-savedmodel/saved_model/
 debug.bmp
+.DS_Store

source/custom.cpp

@@ -85,6 +85,10 @@ int main(int argc, char **argv) {
     numpy::signal_from_buffer(&raw_features[0], raw_features.size(), &signal);
 
     EI_IMPULSE_ERROR res = run_classifier(&signal, &result, false);
+    if (res != EI_IMPULSE_OK) {
+        printf("run_classifier failed (%d)\n", (int)res);
+        return 1;
+    }
     // print the predictions
     printf("Predictions (DSP: %d ms., Classification: %d ms., Anomaly: %d ms.): \n",
                 result.timing.dsp, result.timing.classification, result.timing.anomaly);
@@ -119,7 +123,7 @@ int main(int argc, char **argv) {
         printf("\n");
     }
 #endif
-#if EI_CLASSIFIER_HAS_ANOMALY == 3 // visual AD
+#if EI_CLASSIFIER_HAS_ANOMALY == EI_ANOMALY_TYPE_VISUAL_GMM // visual AD
     printf("#Visual anomaly grid results:\n");
     for (uint32_t i = 0; i < result.visual_ad_count; i++) {
         ei_impulse_result_bounding_box_t bb = result.visual_ad_grid_cells[i];

source/eim.cpp

@@ -3,11 +3,14 @@
 #include <cstring>
 #include <iostream>
 #include <sstream>
+// #include <thread>
 #include <chrono>
 #include <vector>
 #include "edge-impulse-sdk/classifier/ei_run_classifier.h"
 #include "json/json.hpp"
 #include "rapidjson/document.h"
+#include "rapidjson/prettywriter.h"
+#include "rapidjson/stringbuffer.h"
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>
@@ -165,11 +168,12 @@ void json_message_handler(rapidjson::Document &msg, char *resp_buffer, size_t re
 
     auto id = id_v.GetInt();
 
-    rapidjson::Value& version = msg["hello"];
+    rapidjson::Value& hello = msg["hello"];
     rapidjson::Value& classify_data = msg["classify"];
     rapidjson::Value& classify_data_continuous = msg["classify_continuous"];
+    rapidjson::Value& set_threshold = msg["set_threshold"];
 
-    if (version.IsInt()) {
+    if (hello.IsInt()) {
         if (state.initialized) {
             nlohmann::json err = {
                 {"id", id},
@@ -180,11 +184,11 @@ void json_message_handler(rapidjson::Document &msg, char *resp_buffer, size_t re
             return;
         }
 
-        if (version.GetInt() != 1) {
+        if (hello.GetInt() != 1) {
             nlohmann::json err = {
                 {"id", id},
                 {"success", false},
-                {"error", "Invalid 'version', only 1 supported"},
+                {"error", "Invalid value for 'hello', only 1 supported"},
             };
             snprintf(resp_buffer, resp_buffer_size, "%s\n", err.dump().c_str());
             return;
@@ -219,6 +223,30 @@ void json_message_handler(rapidjson::Document &msg, char *resp_buffer, size_t re
     const char *model_type = "classification";
 #endif // EI_CLASSIFIER_OBJECT_DETECTION
 
+        // keep track of configurable thresholds
+        nlohmann::json thresholds = nlohmann::json::array();
+        for (size_t ix = 0; ix < ei_learning_blocks_size; ix++) {
+            const ei_learning_block_t learn_block = ei_learning_blocks[ix];
+            if (learn_block.infer_fn == run_gmm_anomaly) {
+                ei_learning_block_config_anomaly_gmm_t *config = (ei_learning_block_config_anomaly_gmm_t*)learn_block.config;
+                thresholds.push_back({
+                    { "id", learn_block.blockId },
+                    { "type", "anomaly_gmm" },
+                    { "min_anomaly_score", config->anomaly_threshold }
+                });
+            }
+            else if (learn_block.infer_fn == run_nn_inference) {
+                ei_learning_block_config_tflite_graph_t *config = (ei_learning_block_config_tflite_graph_t*)learn_block.config;
+                if (config->classification_mode == EI_CLASSIFIER_CLASSIFICATION_MODE_OBJECT_DETECTION) {
+                    thresholds.push_back({
+                        { "id", learn_block.blockId },
+                        { "type", "object_detection" },
+                        { "min_score", config->threshold }
+                    });
+                }
+            }
+        }
+
         nlohmann::json resp = {
             {"id", id},
             {"success", true},
@@ -246,13 +274,14 @@ void json_message_handler(rapidjson::Document &msg, char *resp_buffer, size_t re
                 {"slice_size", EI_CLASSIFIER_SLICE_SIZE},
                 {"use_continuous_mode", EI_CLASSIFIER_SENSOR == EI_CLASSIFIER_SENSOR_MICROPHONE},
                 {"inferencing_engine", EI_CLASSIFIER_INFERENCING_ENGINE},
+                {"thresholds", thresholds},
             }},
         };
 
         snprintf(resp_buffer, resp_buffer_size, "%s\n", resp.dump().c_str());
 
         state.initialized = true;
-        state.version = version.GetInt();
+        state.version = hello.GetInt();
     }
     else if (!state.initialized) {
         nlohmann::json err = {
@@ -353,6 +382,59 @@ void json_message_handler(rapidjson::Document &msg, char *resp_buffer, size_t re
         json_send_classification_response(id, json_parsing_ms, stdin_ms,
             res, &result, resp_buffer, resp_buffer_size);
     }
+    else if (set_threshold.IsObject()) {
+        if (!set_threshold.HasMember("id") || !set_threshold["id"].IsInt()) {
+            nlohmann::json err = {
+                {"id", id},
+                {"success", false},
+                {"error", "set_threshold should have a numeric field 'id'"},
+            };
+            snprintf(resp_buffer, resp_buffer_size, "%s\n", err.dump().c_str());
+            return;
+        }
+
+        bool found_block = false;
+        int block_id = set_threshold["id"].GetInt();
+        for (size_t ix = 0; ix < ei_learning_blocks_size; ix++) {
+            const ei_learning_block_t learn_block = ei_learning_blocks[ix];
+            if (learn_block.blockId != block_id) continue;
+
+            found_block = true;
+
+            if (learn_block.infer_fn == run_gmm_anomaly) {
+                ei_learning_block_config_anomaly_gmm_t *config = (ei_learning_block_config_anomaly_gmm_t*)learn_block.config;
+
+                if (set_threshold.HasMember("min_anomaly_score") && set_threshold["min_anomaly_score"].IsNumber()) {
+                    config->anomaly_threshold = set_threshold["min_anomaly_score"].GetFloat();
+                }
+            }
+            else if (learn_block.infer_fn == run_nn_inference) {
+                ei_learning_block_config_tflite_graph_t *config = (ei_learning_block_config_tflite_graph_t*)learn_block.config;
+                if (config->classification_mode == EI_CLASSIFIER_CLASSIFICATION_MODE_OBJECT_DETECTION) {
+                    if (set_threshold.HasMember("min_score") && set_threshold["min_score"].IsNumber()) {
+                        config->threshold = set_threshold["min_score"].GetFloat();
+                    }
+                }
+            }
+        }
+
+        if (!found_block) {
+            nlohmann::json err = {
+                {"id", id},
+                {"success", false},
+                {"error", "set_threshold: cannot find learn block with this id"},
+            };
+            snprintf(resp_buffer, resp_buffer_size, "%s\n", err.dump().c_str());
+            return;
+        }
+
+        nlohmann::json resp = {
+            {"id", id},
+            {"success", true},
+        };
+        snprintf(resp_buffer, resp_buffer_size, "%s\n", resp.dump().c_str());
+        return;
+    }
     else {
         nlohmann::json err = {
             {"id", id},
@@ -364,6 +446,32 @@ void json_message_handler(rapidjson::Document &msg, char *resp_buffer, size_t re
     }
 }
 
+int print_metadata_main() {
+    char output_buffer[100 * 1024] = { 0 };
+
+    // Construct a hello msg into output_buffer
+    {
+        rapidjson::Document msg;
+        msg.SetObject();
+        rapidjson::Document::AllocatorType& allocator = msg.GetAllocator();
+        msg.AddMember("id", 1, allocator);
+        msg.AddMember("hello", 1, allocator);
+        json_message_handler(msg, output_buffer, 100 * 1024, 0, 0);
+    }
+
+    // pretty print (by first parsing, then re-printing)
+    {
+        rapidjson::Document document;
+        document.Parse(output_buffer);
+        rapidjson::StringBuffer buffer;
+        rapidjson::PrettyWriter<rapidjson::StringBuffer> writer(buffer);
+        document.Accept(writer);
+        printf("%s\n", buffer.GetString());
+    }
+
+    return 0;
+}
+
 int stdin_main() {
     static char *stdin_buffer = (char *)malloc(STDIN_BUFFER_SIZE);
     static char *response_buffer = (char *)calloc(STDIN_BUFFER_SIZE, 1);
@@ -559,12 +667,16 @@ int main(int argc, char **argv) {
     setvbuf(stdout, NULL, _IONBF, 0);
 
     if (argc < 2) {
-        printf("Requires one parameter (either: 'stdin' or the name of a socket)\n");
+        printf("Requires one parameter (either: '--print-info', 'stdin' or the name of a socket)\n");
         return 1;
     }
 
     state.initialized = false;
 
+    if (strcmp(argv[1], "--print-info") == 0) {
+        printf("Edge Impulse Linux impulse runner - printing model metadata\n");
+        return print_metadata_main();
+    }
     if (strcmp(argv[1], "stdin") == 0) {
         printf("Edge Impulse Linux impulse runner - listening for JSON messages on stdin\n");
         return stdin_main();