Optimized memory allocation for Detection (inference only), without allocation memory for training

include/darknet.h

@@ -190,6 +190,7 @@ struct layer {
     void(*backward_gpu)  (struct layer, struct network_state);
     void(*update_gpu)    (struct layer, int, float, float, float);
     layer *share_layer;
+    int train;
     int batch_normalize;
     int shortcut;
     int batch;

src/conv_lstm_layer.c

@@ -32,7 +32,7 @@ static void increment_layer(layer *l, int steps)
 }
 
 
-layer make_conv_lstm_layer(int batch, int h, int w, int c, int output_filters, int groups, int steps, int size, int stride, int dilation, int pad, ACTIVATION activation, int batch_normalize, int peephole, int xnor)
+layer make_conv_lstm_layer(int batch, int h, int w, int c, int output_filters, int groups, int steps, int size, int stride, int dilation, int pad, ACTIVATION activation, int batch_normalize, int peephole, int xnor, int train)
 {
     fprintf(stderr, "CONV_LSTM Layer: %d x %d x %d image, %d filters\n", h, w, c, output_filters);
     /*
@@ -48,6 +48,7 @@ layer make_conv_lstm_layer(int batch, int h, int w, int c, int output_filters, i
     */
     batch = batch / steps;
     layer l = { (LAYER_TYPE)0 };
+    l.train = train;
     l.batch = batch;
     l.type = CONV_LSTM;
     l.steps = steps;
@@ -66,44 +67,44 @@ layer make_conv_lstm_layer(int batch, int h, int w, int c, int output_filters, i
 
     // U
     l.uf = (layer*)calloc(1, sizeof(layer));
-    *(l.uf) = make_convolutional_layer(batch, steps, h, w, c, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+    *(l.uf) = make_convolutional_layer(batch, steps, h, w, c, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
     l.uf->batch = batch;
     if (l.workspace_size < l.uf->workspace_size) l.workspace_size = l.uf->workspace_size;
 
     l.ui = (layer*)calloc(1, sizeof(layer));
-    *(l.ui) = make_convolutional_layer(batch, steps, h, w, c, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+    *(l.ui) = make_convolutional_layer(batch, steps, h, w, c, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
     l.ui->batch = batch;
     if (l.workspace_size < l.ui->workspace_size) l.workspace_size = l.ui->workspace_size;
 
     l.ug = (layer*)calloc(1, sizeof(layer));
-    *(l.ug) = make_convolutional_layer(batch, steps, h, w, c, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+    *(l.ug) = make_convolutional_layer(batch, steps, h, w, c, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
     l.ug->batch = batch;
     if (l.workspace_size < l.ug->workspace_size) l.workspace_size = l.ug->workspace_size;
 
     l.uo = (layer*)calloc(1, sizeof(layer));
-    *(l.uo) = make_convolutional_layer(batch, steps, h, w, c, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+    *(l.uo) = make_convolutional_layer(batch, steps, h, w, c, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
     l.uo->batch = batch;
     if (l.workspace_size < l.uo->workspace_size) l.workspace_size = l.uo->workspace_size;
 
 
     // W
     l.wf = (layer*)calloc(1, sizeof(layer));
-    *(l.wf) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+    *(l.wf) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
     l.wf->batch = batch;
     if (l.workspace_size < l.wf->workspace_size) l.workspace_size = l.wf->workspace_size;
 
     l.wi = (layer*)calloc(1, sizeof(layer));
-    *(l.wi) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+    *(l.wi) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
     l.wi->batch = batch;
     if (l.workspace_size < l.wi->workspace_size) l.workspace_size = l.wi->workspace_size;
 
     l.wg = (layer*)calloc(1, sizeof(layer));
-    *(l.wg) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+    *(l.wg) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
     l.wg->batch = batch;
     if (l.workspace_size < l.wg->workspace_size) l.workspace_size = l.wg->workspace_size;
 
     l.wo = (layer*)calloc(1, sizeof(layer));
-    *(l.wo) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+    *(l.wo) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
     l.wo->batch = batch;
     if (l.workspace_size < l.wo->workspace_size) l.workspace_size = l.wo->workspace_size;
 
@@ -111,21 +112,21 @@ layer make_conv_lstm_layer(int batch, int h, int w, int c, int output_filters, i
     // V
     l.vf = (layer*)calloc(1, sizeof(layer));
     if (l.peephole) {
-        *(l.vf) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+        *(l.vf) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
         l.vf->batch = batch;
         if (l.workspace_size < l.vf->workspace_size) l.workspace_size = l.vf->workspace_size;
     }
 
     l.vi = (layer*)calloc(1, sizeof(layer));
     if (l.peephole) {
-        *(l.vi) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+        *(l.vi) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
         l.vi->batch = batch;
         if (l.workspace_size < l.vi->workspace_size) l.workspace_size = l.vi->workspace_size;
     }
 
     l.vo = (layer*)calloc(1, sizeof(layer));
     if (l.peephole) {
-        *(l.vo) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+        *(l.vo) = make_convolutional_layer(batch, steps, h, w, output_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
         l.vo->batch = batch;
         if (l.workspace_size < l.vo->workspace_size) l.workspace_size = l.vo->workspace_size;
     }

src/conv_lstm_layer.h

@@ -9,7 +9,7 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
-layer make_conv_lstm_layer(int batch, int h, int w, int c, int output_filters, int groups, int steps, int size, int stride, int dilation, int pad, ACTIVATION activation, int batch_normalize, int peephole, int xnor);
+layer make_conv_lstm_layer(int batch, int h, int w, int c, int output_filters, int groups, int steps, int size, int stride, int dilation, int pad, ACTIVATION activation, int batch_normalize, int peephole, int xnor, int train);
 void resize_conv_lstm_layer(layer *l, int w, int h);
 void free_state_conv_lstm(layer l);
 void randomize_state_conv_lstm(layer l);

src/convolutional_kernels.cu

@@ -986,7 +986,8 @@ void assisted_excitation_forward_gpu(convolutional_layer l, network_state state)
     }
     else {
         if (iteration_num < state.net.burn_in) return;
-        else if (iteration_num > l.assisted_excitation) return;
+        else
+            if (iteration_num > l.assisted_excitation) return;
         else
             alpha = (1 + cos(3.141592 * iteration_num / (state.net.burn_in + l.assisted_excitation))) / 2; // from 1 to 0
     }
@@ -1018,6 +1019,7 @@ void assisted_excitation_forward_gpu(convolutional_layer l, network_state state)
         for (t = 0; t < state.net.num_boxes; ++t) {
             box truth = float_to_box_stride(truth_cpu + t*(4 + 1) + b*l.truths, 1);
             if (!truth.x) break;  // continue;
+            //float beta = 0;
             float beta = 1 - alpha; // from 0 to 1
             float dw = (1 - truth.w) * beta;
             float dh = (1 - truth.h) * beta;
@@ -1162,8 +1164,10 @@ void push_convolutional_layer(convolutional_layer l)
     cuda_convert_f32_to_f16(l.weights_gpu, l.nweights, l.weights_gpu16);
 #endif
     cuda_push_array(l.biases_gpu, l.biases, l.n);
-    cuda_push_array(l.weight_updates_gpu, l.weight_updates, l.nweights);
-    cuda_push_array(l.bias_updates_gpu, l.bias_updates, l.n);
+    if (l.train) {
+        cuda_push_array(l.weight_updates_gpu, l.weight_updates, l.nweights);
+        cuda_push_array(l.bias_updates_gpu, l.bias_updates, l.n);
+    }
     if (l.batch_normalize){
         cuda_push_array(l.scales_gpu, l.scales, l.n);
         cuda_push_array(l.rolling_mean_gpu, l.rolling_mean, l.n);

src/convolutional_layer.c

@@ -123,7 +123,7 @@ size_t get_workspace_size32(layer l){
                 l.dweightDesc,
                 l.bf_algo,
                 &s));
-        if (s > most) most = s;
+        if (s > most && l.train) most = s;
         CHECK_CUDNN(cudnnGetConvolutionBackwardDataWorkspaceSize(cudnn_handle(),
                 l.weightDesc,
                 l.ddstTensorDesc,
@@ -131,7 +131,7 @@ size_t get_workspace_size32(layer l){
                 l.dsrcTensorDesc,
                 l.bd_algo,
                 &s));
-        if (s > most) most = s;
+        if (s > most && l.train) most = s;
         return most;
     }
     #endif
@@ -164,7 +164,7 @@ size_t get_workspace_size16(layer l) {
             l.dweightDesc16,
             l.bf_algo16,
             &s));
-        if (s > most) most = s;
+        if (s > most && l.train) most = s;
         CHECK_CUDNN(cudnnGetConvolutionBackwardDataWorkspaceSize(cudnn_handle(),
             l.weightDesc16,
             l.ddstTensorDesc16,
@@ -172,7 +172,7 @@ size_t get_workspace_size16(layer l) {
             l.dsrcTensorDesc16,
             l.bd_algo16,
             &s));
-        if (s > most) most = s;
+        if (s > most && l.train) most = s;
         return most;
     }
 #endif
@@ -333,12 +333,43 @@ void cudnn_convolutional_setup(layer *l, int cudnn_preference)
 #endif
 #endif
 
-convolutional_layer make_convolutional_layer(int batch, int steps, int h, int w, int c, int n, int groups, int size, int stride_x, int stride_y, int dilation, int padding, ACTIVATION activation, int batch_normalize, int binary, int xnor, int adam, int use_bin_output, int index, int antialiasing, convolutional_layer *share_layer, int assisted_excitation)
+
+void free_convolutional_batchnorm(convolutional_layer *l)
+{
+    if (!l->share_layer) {
+        free(l->scales);
+        free(l->scale_updates);
+        free(l->mean);
+        free(l->variance);
+        free(l->mean_delta);
+        free(l->variance_delta);
+        free(l->rolling_mean);
+        free(l->rolling_variance);
+        free(l->x);
+        free(l->x_norm);
+
+#ifdef GPU
+        cuda_free(l->scales_gpu);
+        cuda_free(l->scale_updates_gpu);
+        cuda_free(l->mean_gpu);
+        cuda_free(l->variance_gpu);
+        cuda_free(l->mean_delta_gpu);
+        cuda_free(l->variance_delta_gpu);
+        cuda_free(l->rolling_mean_gpu);
+        cuda_free(l->rolling_variance_gpu);
+        cuda_free(l->x_gpu);
+        cuda_free(l->x_norm_gpu);
+#endif
+    }
+}
+
+convolutional_layer make_convolutional_layer(int batch, int steps, int h, int w, int c, int n, int groups, int size, int stride_x, int stride_y, int dilation, int padding, ACTIVATION activation, int batch_normalize, int binary, int xnor, int adam, int use_bin_output, int index, int antialiasing, convolutional_layer *share_layer, int assisted_excitation, int train)
 {
     int total_batch = batch*steps;
     int i;
     convolutional_layer l = { (LAYER_TYPE)0 };
     l.type = CONVOLUTIONAL;
+    l.train = train;
 
     if (xnor) groups = 1;   // disable groups for XNOR-net
     if (groups < 1) groups = 1;
@@ -382,10 +413,12 @@ convolutional_layer make_convolutional_layer(int batch, int steps, int h, int w,
     }
     else {
         l.weights = (float*)calloc(l.nweights, sizeof(float));
-        l.weight_updates = (float*)calloc(l.nweights, sizeof(float));
-
         l.biases = (float*)calloc(n, sizeof(float));
-        l.bias_updates = (float*)calloc(n, sizeof(float));
+
+        if (train) {
+            l.weight_updates = (float*)calloc(l.nweights, sizeof(float));
+            l.bias_updates = (float*)calloc(n, sizeof(float));
+        }
     }
 
     // float scale = 1./sqrt(size*size*c);
@@ -401,7 +434,7 @@ convolutional_layer make_convolutional_layer(int batch, int steps, int h, int w,
     l.activation = activation;
 
     l.output = (float*)calloc(total_batch*l.outputs, sizeof(float));
-    l.delta  = (float*)calloc(total_batch*l.outputs, sizeof(float));
+    if (train) l.delta = (float*)calloc(total_batch*l.outputs, sizeof(float));
 
     l.forward = forward_convolutional_layer;
     l.backward = backward_convolutional_layer;
@@ -445,23 +478,27 @@ convolutional_layer make_convolutional_layer(int batch, int steps, int h, int w,
         }
         else {
             l.scales = (float*)calloc(n, sizeof(float));
-            l.scale_updates = (float*)calloc(n, sizeof(float));
             for (i = 0; i < n; ++i) {
                 l.scales[i] = 1;
             }
+            if (train) {
+                l.scale_updates = (float*)calloc(n, sizeof(float));
 
-            l.mean = (float*)calloc(n, sizeof(float));
-            l.variance = (float*)calloc(n, sizeof(float));
+                l.mean = (float*)calloc(n, sizeof(float));
+                l.variance = (float*)calloc(n, sizeof(float));
 
-            l.mean_delta = (float*)calloc(n, sizeof(float));
-            l.variance_delta = (float*)calloc(n, sizeof(float));
+                l.mean_delta = (float*)calloc(n, sizeof(float));
+                l.variance_delta = (float*)calloc(n, sizeof(float));
+            }
 
             l.rolling_mean = (float*)calloc(n, sizeof(float));
             l.rolling_variance = (float*)calloc(n, sizeof(float));
         }
 
-        l.x = (float*)calloc(total_batch * l.outputs, sizeof(float));
-        l.x_norm = (float*)calloc(total_batch * l.outputs, sizeof(float));
+        if (train) {
+            l.x = (float*)calloc(total_batch * l.outputs, sizeof(float));
+            l.x_norm = (float*)calloc(total_batch * l.outputs, sizeof(float));
+        }
     }
     if(adam){
         l.adam = 1;
@@ -501,17 +538,17 @@ convolutional_layer make_convolutional_layer(int batch, int steps, int h, int w,
         }
         else {
             l.weights_gpu = cuda_make_array(l.weights, l.nweights);
-            l.weight_updates_gpu = cuda_make_array(l.weight_updates, l.nweights);
+            if (train) l.weight_updates_gpu = cuda_make_array(l.weight_updates, l.nweights);
 #ifdef CUDNN_HALF
             l.weights_gpu16 = cuda_make_array(NULL, l.nweights / 2 + 1);
-            l.weight_updates_gpu16 = cuda_make_array(NULL, l.nweights / 2 + 1);
+            if (train) l.weight_updates_gpu16 = cuda_make_array(NULL, l.nweights / 2 + 1);
 #endif  // CUDNN_HALF
             l.biases_gpu = cuda_make_array(l.biases, n);
-            l.bias_updates_gpu = cuda_make_array(l.bias_updates, n);
+            if (train) l.bias_updates_gpu = cuda_make_array(l.bias_updates, n);
         }
 
         l.output_gpu = cuda_make_array(l.output, total_batch*out_h*out_w*n);
-        l.delta_gpu = cuda_make_array(l.delta, total_batch*out_h*out_w*n);
+        if (train) l.delta_gpu = cuda_make_array(l.delta, total_batch*out_h*out_w*n);
 
         if(binary){
             l.binary_weights_gpu = cuda_make_array(l.weights, l.nweights);
@@ -535,19 +572,25 @@ convolutional_layer make_convolutional_layer(int batch, int steps, int h, int w,
             }
             else {
                 l.scales_gpu = cuda_make_array(l.scales, n);
-                l.scale_updates_gpu = cuda_make_array(l.scale_updates, n);
 
-                l.mean_gpu = cuda_make_array(l.mean, n);
-                l.variance_gpu = cuda_make_array(l.variance, n);
+                if (train) {
+                    l.scale_updates_gpu = cuda_make_array(l.scale_updates, n);
+
+                    l.mean_gpu = cuda_make_array(l.mean, n);
+                    l.variance_gpu = cuda_make_array(l.variance, n);
+
+                    l.mean_delta_gpu = cuda_make_array(l.mean, n);
+                    l.variance_delta_gpu = cuda_make_array(l.variance, n);
+                }
 
                 l.rolling_mean_gpu = cuda_make_array(l.mean, n);
                 l.rolling_variance_gpu = cuda_make_array(l.variance, n);
+            }
 
-                l.mean_delta_gpu = cuda_make_array(l.mean, n);
-                l.variance_delta_gpu = cuda_make_array(l.variance, n);
+            if (train) {
+                l.x_gpu = cuda_make_array(l.output, total_batch*out_h*out_w*n);
+                l.x_norm_gpu = cuda_make_array(l.output, total_batch*out_h*out_w*n);
             }
-            l.x_gpu = cuda_make_array(l.output, total_batch*out_h*out_w*n);
-            l.x_norm_gpu = cuda_make_array(l.output, total_batch*out_h*out_w*n);
         }
 
         if (l.assisted_excitation)
@@ -594,7 +637,7 @@ convolutional_layer make_convolutional_layer(int batch, int steps, int h, int w,
             blur_size = 2;
             blur_pad = 0;
         }
-        *(l.input_layer) = make_convolutional_layer(batch, steps, out_h, out_w, n, n, n, blur_size, blur_stride_x, blur_stride_y, 1, blur_pad, LINEAR, 0, 0, 0, 0, 0, index, 0, NULL, 0);
+        *(l.input_layer) = make_convolutional_layer(batch, steps, out_h, out_w, n, n, n, blur_size, blur_stride_x, blur_stride_y, 1, blur_pad, LINEAR, 0, 0, 0, 0, 0, index, 0, NULL, 0, train);
         const int blur_nweights = n * blur_size * blur_size;  // (n / n) * n * blur_size * blur_size;
         int i;
         if (blur_size == 2) {
@@ -649,7 +692,7 @@ void denormalize_convolutional_layer(convolutional_layer l)
 
 void test_convolutional_layer()
 {
-    convolutional_layer l = make_convolutional_layer(1, 1, 5, 5, 3, 2, 1, 5, 2, 2, 1, 1, LEAKY, 1, 0, 0, 0, 0, 0, 0, NULL, 0);
+    convolutional_layer l = make_convolutional_layer(1, 1, 5, 5, 3, 2, 1, 5, 2, 2, 1, 1, LEAKY, 1, 0, 0, 0, 0, 0, 0, NULL, 0, 0);
     l.batch_normalize = 1;
     float data[] = {1,1,1,1,1,
         1,1,1,1,1,
@@ -688,10 +731,13 @@ void resize_convolutional_layer(convolutional_layer *l, int w, int h)
     l->inputs = l->w * l->h * l->c;
 
     l->output = (float*)realloc(l->output, total_batch * l->outputs * sizeof(float));
-    l->delta = (float*)realloc(l->delta, total_batch * l->outputs * sizeof(float));
-    if(l->batch_normalize){
-        l->x = (float*)realloc(l->x, total_batch * l->outputs * sizeof(float));
-        l->x_norm = (float*)realloc(l->x_norm, total_batch * l->outputs * sizeof(float));
+    if (l->train) {
+        l->delta = (float*)realloc(l->delta, total_batch * l->outputs * sizeof(float));
+
+        if (l->batch_normalize) {
+            l->x = (float*)realloc(l->x, total_batch * l->outputs * sizeof(float));
+            l->x_norm = (float*)realloc(l->x_norm, total_batch * l->outputs * sizeof(float));
+        }
     }
 
     if (l->xnor) {
@@ -700,10 +746,12 @@ void resize_convolutional_layer(convolutional_layer *l, int w, int h)
 
 #ifdef GPU
     if (old_w < w || old_h < h) {
-        cuda_free(l->delta_gpu);
-        cuda_free(l->output_gpu);
+        if (l->train) {
+            cuda_free(l->delta_gpu);
+            l->delta_gpu = cuda_make_array(l->delta, total_batch*l->outputs);
+        }
 
-        l->delta_gpu = cuda_make_array(l->delta, total_batch*l->outputs);
+        cuda_free(l->output_gpu);
         l->output_gpu = cuda_make_array(l->output, total_batch*l->outputs);
 
         if (l->batch_normalize) {
@@ -1246,7 +1294,7 @@ void assisted_excitation_forward(convolutional_layer l, network_state state)
         }
     }
 
-    if(1)   // visualize ground truth
+    if(0)   // visualize ground truth
     {
 #ifdef OPENCV
         for (b = 0; b < l.batch; ++b)

src/convolutional_layer.h

@@ -28,9 +28,10 @@ void create_convolutional_cudnn_tensors(layer *l);
 void cuda_convert_f32_to_f16(float* input_f32, size_t size, float *output_f16);
 #endif
 #endif
+void free_convolutional_batchnorm(convolutional_layer *l);
 
 size_t get_convolutional_workspace_size(layer l);
-convolutional_layer make_convolutional_layer(int batch, int steps, int h, int w, int c, int n, int groups, int size, int stride_x, int stride_y, int dilation, int padding, ACTIVATION activation, int batch_normalize, int binary, int xnor, int adam, int use_bin_output, int index, int antialiasing, convolutional_layer *share_layer, int assisted_excitation);
+convolutional_layer make_convolutional_layer(int batch, int steps, int h, int w, int c, int n, int groups, int size, int stride_x, int stride_y, int dilation, int padding, ACTIVATION activation, int batch_normalize, int binary, int xnor, int adam, int use_bin_output, int index, int antialiasing, convolutional_layer *share_layer, int assisted_excitation, int train);
 void denormalize_convolutional_layer(convolutional_layer l);
 void resize_convolutional_layer(convolutional_layer *layer, int w, int h);
 void forward_convolutional_layer(const convolutional_layer layer, network_state state);

src/crnn_layer.c

@@ -26,11 +26,12 @@ static void increment_layer(layer *l, int steps)
 #endif
 }
 
-layer make_crnn_layer(int batch, int h, int w, int c, int hidden_filters, int output_filters, int groups, int steps, int size, int stride, int dilation, int pad, ACTIVATION activation, int batch_normalize, int xnor)
+layer make_crnn_layer(int batch, int h, int w, int c, int hidden_filters, int output_filters, int groups, int steps, int size, int stride, int dilation, int pad, ACTIVATION activation, int batch_normalize, int xnor, int train)
 {
     fprintf(stderr, "CRNN Layer: %d x %d x %d image, %d filters\n", h,w,c,output_filters);
     batch = batch / steps;
     layer l = { (LAYER_TYPE)0 };
+    l.train = train;
     l.batch = batch;
     l.type = CRNN;
     l.steps = steps;
@@ -50,17 +51,17 @@ layer make_crnn_layer(int batch, int h, int w, int c, int hidden_filters, int ou
     l.state = (float*)calloc(l.hidden * l.batch * (l.steps + 1), sizeof(float));
 
     l.input_layer = (layer*)calloc(1, sizeof(layer));
-    *(l.input_layer) = make_convolutional_layer(batch, steps, h, w, c, hidden_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+    *(l.input_layer) = make_convolutional_layer(batch, steps, h, w, c, hidden_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
     l.input_layer->batch = batch;
     if (l.workspace_size < l.input_layer->workspace_size) l.workspace_size = l.input_layer->workspace_size;
 
     l.self_layer = (layer*)calloc(1, sizeof(layer));
-    *(l.self_layer) = make_convolutional_layer(batch, steps, h, w, hidden_filters, hidden_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+    *(l.self_layer) = make_convolutional_layer(batch, steps, h, w, hidden_filters, hidden_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
     l.self_layer->batch = batch;
     if (l.workspace_size < l.self_layer->workspace_size) l.workspace_size = l.self_layer->workspace_size;
 
     l.output_layer = (layer*)calloc(1, sizeof(layer));
-    *(l.output_layer) = make_convolutional_layer(batch, steps, h, w, hidden_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0);
+    *(l.output_layer) = make_convolutional_layer(batch, steps, h, w, hidden_filters, output_filters, groups, size, stride, stride, dilation, pad, activation, batch_normalize, 0, xnor, 0, 0, 0, 0, NULL, 0, train);
     l.output_layer->batch = batch;
     if (l.workspace_size < l.output_layer->workspace_size) l.workspace_size = l.output_layer->workspace_size;
 

src/crnn_layer.h

@@ -9,7 +9,7 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
-layer make_crnn_layer(int batch, int h, int w, int c, int hidden_filters, int output_filters, int groups, int steps, int size, int stride, int dilation, int pad, ACTIVATION activation, int batch_normalize, int xnor);
+layer make_crnn_layer(int batch, int h, int w, int c, int hidden_filters, int output_filters, int groups, int steps, int size, int stride, int dilation, int pad, ACTIVATION activation, int batch_normalize, int xnor, int train);
 void resize_crnn_layer(layer *l, int w, int h);
 void free_state_crnn(layer l);
 

src/gemm.c

@@ -1949,7 +1949,7 @@ void forward_maxpool_layer_avx(float *src, float *dst, int *indexes, int size, i
                         }
                     }
                     dst[out_index] = max;
-                    indexes[out_index] = max_i;
+                    if (indexes) indexes[out_index] = max_i;
                 }
             }
         }
@@ -2452,7 +2452,7 @@ void forward_maxpool_layer_avx(float *src, float *dst, int *indexes, int size, i
                         }
                     }
                     dst[out_index] = max;
-                    indexes[out_index] = max_i;
+                    if (indexes) indexes[out_index] = max_i;
                 }
             }
         }

src/maxpool_layer.c

@@ -46,10 +46,11 @@ void cudnn_maxpool_setup(layer *l)
 }
 
 
-maxpool_layer make_maxpool_layer(int batch, int h, int w, int c, int size, int stride_x, int stride_y, int padding, int maxpool_depth, int out_channels, int antialiasing)
+maxpool_layer make_maxpool_layer(int batch, int h, int w, int c, int size, int stride_x, int stride_y, int padding, int maxpool_depth, int out_channels, int antialiasing, int train)
 {
     maxpool_layer l = { (LAYER_TYPE)0 };
     l.type = MAXPOOL;
+    l.train = train;
 
     const int blur_stride_x = stride_x;
     const int blur_stride_y = stride_y;
@@ -82,21 +83,25 @@ maxpool_layer make_maxpool_layer(int batch, int h, int w, int c, int size, int s
     l.stride_x = stride_x;
     l.stride_y = stride_y;
     int output_size = l.out_h * l.out_w * l.out_c * batch;
-    l.indexes = (int*)calloc(output_size, sizeof(int));
+
+    if (train) {
+        l.indexes = (int*)calloc(output_size, sizeof(int));
+        l.delta = (float*)calloc(output_size, sizeof(float));
+    }
     l.output = (float*)calloc(output_size, sizeof(float));
-    l.delta = (float*)calloc(output_size, sizeof(float));
     l.forward = forward_maxpool_layer;
     l.backward = backward_maxpool_layer;
-    #ifdef GPU
+#ifdef GPU
     l.forward_gpu = forward_maxpool_layer_gpu;
     l.backward_gpu = backward_maxpool_layer_gpu;
-    l.indexes_gpu = cuda_make_int_array(output_size);
+    if (train) {
+        l.indexes_gpu = cuda_make_int_array(output_size);
+        l.delta_gpu = cuda_make_array(l.delta, output_size);
+    }
     l.output_gpu  = cuda_make_array(l.output, output_size);
-    l.delta_gpu   = cuda_make_array(l.delta, output_size);
-
     cudnn_maxpool_setup(&l);
 
-    #endif  // GPU
+#endif  // GPU
 	l.bflops = (l.size*l.size*l.c * l.out_h*l.out_w) / 1000000000.;
     if (maxpool_depth)
         fprintf(stderr, "max-depth         %2dx%2d/%2d   %4d x%4d x%4d -> %4d x%4d x%4d %5.3f BF\n", size, size, stride_x, w, h, c, l.out_w, l.out_h, l.out_c, l.bflops);
@@ -114,7 +119,7 @@ maxpool_layer make_maxpool_layer(int batch, int h, int w, int c, int size, int s
             blur_size = 2;
             blur_pad = 0;
         }
-        *(l.input_layer) = make_convolutional_layer(batch, 1, l.out_h, l.out_w, l.out_c, l.out_c, l.out_c, blur_size, blur_stride_x, blur_stride_y, 1, blur_pad, LINEAR, 0, 0, 0, 0, 0, 1, 0, NULL, 0);
+        *(l.input_layer) = make_convolutional_layer(batch, 1, l.out_h, l.out_w, l.out_c, l.out_c, l.out_c, blur_size, blur_stride_x, blur_stride_y, 1, blur_pad, LINEAR, 0, 0, 0, 0, 0, 1, 0, NULL, 0, train);
         const int blur_nweights = l.out_c * blur_size * blur_size;  // (n / n) * n * blur_size * blur_size;
         int i;
         if (blur_size == 2) {
@@ -163,17 +168,22 @@ void resize_maxpool_layer(maxpool_layer *l, int w, int h)
     l->outputs = l->out_w * l->out_h * l->out_c;
     int output_size = l->outputs * l->batch;
 
-    l->indexes = (int*)realloc(l->indexes, output_size * sizeof(int));
+    if (l->train) {
+        l->indexes = (int*)realloc(l->indexes, output_size * sizeof(int));
+        l->delta = (float*)realloc(l->delta, output_size * sizeof(float));
+    }
     l->output = (float*)realloc(l->output, output_size * sizeof(float));
-    l->delta = (float*)realloc(l->delta, output_size * sizeof(float));
 
 #ifdef GPU
-    CHECK_CUDA(cudaFree((float *)l->indexes_gpu));
     CHECK_CUDA(cudaFree(l->output_gpu));
-    CHECK_CUDA(cudaFree(l->delta_gpu));
-    l->indexes_gpu = cuda_make_int_array(output_size);
     l->output_gpu  = cuda_make_array(l->output, output_size);
-    l->delta_gpu   = cuda_make_array(l->delta,  output_size);
+
+    if (l->train) {
+        CHECK_CUDA(cudaFree((float *)l->indexes_gpu));
+        CHECK_CUDA(cudaFree(l->delta_gpu));
+        l->indexes_gpu = cuda_make_int_array(output_size);
+        l->delta_gpu = cuda_make_array(l->delta, output_size);
+    }
 
     cudnn_maxpool_setup(l);
 #endif
@@ -203,7 +213,7 @@ void forward_maxpool_layer(const maxpool_layer l, network_state state)
                             max = (val > max) ? val : max;
                         }
                         l.output[out_index] = max;
-                        l.indexes[out_index] = max_i;
+                        if (l.indexes) l.indexes[out_index] = max_i;
                     }
                 }
             }
@@ -245,7 +255,7 @@ void forward_maxpool_layer(const maxpool_layer l, network_state state)
                             }
                         }
                         l.output[out_index] = max;
-                        l.indexes[out_index] = max_i;
+                        if (l.indexes) l.indexes[out_index] = max_i;
                     }
                 }
             }

src/maxpool_layer.h

@@ -12,7 +12,7 @@ typedef layer maxpool_layer;
 extern "C" {
 #endif
 image get_maxpool_image(maxpool_layer l);
-maxpool_layer make_maxpool_layer(int batch, int h, int w, int c, int size, int stride_x, int stride_y, int padding, int maxpool_depth, int out_channels, int antialiasing);
+maxpool_layer make_maxpool_layer(int batch, int h, int w, int c, int size, int stride_x, int stride_y, int padding, int maxpool_depth, int out_channels, int antialiasing, int train);
 void resize_maxpool_layer(maxpool_layer *l, int w, int h);
 void forward_maxpool_layer(const maxpool_layer l, network_state state);
 void backward_maxpool_layer(const maxpool_layer l, network_state state);

src/maxpool_layer_kernels.cu

@@ -36,7 +36,7 @@ __global__ void forward_maxpool_depth_layer_kernel(int n, int w, int h, int c, i
             max = (val > max) ? val : max;
         }
         output[out_index] = max;
-        indexes[out_index] = max_i;
+        if (indexes) indexes[out_index] = max_i;
     }
 }
 
@@ -88,7 +88,7 @@ __global__ void forward_maxpool_layer_kernel(int n, int in_h, int in_w, int in_c
         }
     }
     output[out_index] = max;
-    indexes[out_index] = max_i;
+    if (indexes) indexes[out_index] = max_i;
 }
 
 __global__ void backward_maxpool_layer_kernel(int n, int in_h, int in_w, int in_c, int stride_x, int stride_y, int size, int pad, float *delta, float *prev_delta, int *indexes)

src/network.c

@@ -1071,6 +1071,7 @@ void fuse_conv_batchnorm(network net)
                     }
                 }
 
+                free_convolutional_batchnorm(l);
                 l->batch_normalize = 0;
 #ifdef GPU
                 if (gpu_index >= 0) {

src/parser.c

@@ -130,6 +130,7 @@ typedef struct size_params{
     int c;
     int index;
     int time_steps;
+    int train;
     network net;
 } size_params;
 
@@ -199,7 +200,7 @@ convolutional_layer parse_convolutional(list *options, size_params params)
     int xnor = option_find_int_quiet(options, "xnor", 0);
     int use_bin_output = option_find_int_quiet(options, "bin_output", 0);
 
-    convolutional_layer layer = make_convolutional_layer(batch,1,h,w,c,n,groups,size,stride_x,stride_y,dilation,padding,activation, batch_normalize, binary, xnor, params.net.adam, use_bin_output, params.index, antialiasing, share_layer, assisted_excitation);
+    convolutional_layer layer = make_convolutional_layer(batch,1,h,w,c,n,groups,size,stride_x,stride_y,dilation,padding,activation, batch_normalize, binary, xnor, params.net.adam, use_bin_output, params.index, antialiasing, share_layer, assisted_excitation, params.train);
     layer.flipped = option_find_int_quiet(options, "flipped", 0);
     layer.dot = option_find_float_quiet(options, "dot", 0);
 
@@ -230,7 +231,7 @@ layer parse_crnn(list *options, size_params params)
     int batch_normalize = option_find_int_quiet(options, "batch_normalize", 0);
     int xnor = option_find_int_quiet(options, "xnor", 0);
 
-    layer l = make_crnn_layer(params.batch, params.h, params.w, params.c, hidden_filters, output_filters, groups, params.time_steps, size, stride, dilation, padding, activation, batch_normalize, xnor);
+    layer l = make_crnn_layer(params.batch, params.h, params.w, params.c, hidden_filters, output_filters, groups, params.time_steps, size, stride, dilation, padding, activation, batch_normalize, xnor, params.train);
 
     l.shortcut = option_find_int_quiet(options, "shortcut", 0);
 
@@ -291,7 +292,7 @@ layer parse_conv_lstm(list *options, size_params params)
     int xnor = option_find_int_quiet(options, "xnor", 0);
     int peephole = option_find_int_quiet(options, "peephole", 0);
 
-    layer l = make_conv_lstm_layer(params.batch, params.h, params.w, params.c, output_filters, groups, params.time_steps, size, stride, dilation, padding, activation, batch_normalize, peephole, xnor);
+    layer l = make_conv_lstm_layer(params.batch, params.h, params.w, params.c, output_filters, groups, params.time_steps, size, stride, dilation, padding, activation, batch_normalize, peephole, xnor, params.train);
 
     l.state_constrain = option_find_int_quiet(options, "state_constrain", params.time_steps * 32);
     l.shortcut = option_find_int_quiet(options, "shortcut", 0);
@@ -630,7 +631,7 @@ maxpool_layer parse_maxpool(list *options, size_params params)
     batch=params.batch;
     if(!(h && w && c)) error("Layer before maxpool layer must output image.");
 
-    maxpool_layer layer = make_maxpool_layer(batch, h, w, c, size, stride_x, stride_y, padding, maxpool_depth, out_channels, antialiasing);
+    maxpool_layer layer = make_maxpool_layer(batch, h, w, c, size, stride_x, stride_y, padding, maxpool_depth, out_channels, antialiasing, params.train);
     return layer;
 }
 
@@ -684,7 +685,7 @@ layer parse_shortcut(list *options, size_params params, network net)
     layer from = net.layers[index];
     if (from.antialiasing) from = *from.input_layer;
 
-    layer s = make_shortcut_layer(batch, index, params.w, params.h, params.c, from.out_w, from.out_h, from.out_c, assisted_excitation);
+    layer s = make_shortcut_layer(batch, index, params.w, params.h, params.c, from.out_w, from.out_h, from.out_c, assisted_excitation, params.train);
 
     char *activation_s = option_find_str(options, "activation", "linear");
     ACTIVATION activation = get_activation(activation_s);
@@ -944,6 +945,9 @@ network parse_network_cfg_custom(char *filename, int batch, int time_steps)
     net.gpu_index = gpu_index;
     size_params params;
 
+    if (batch > 0) params.train = 0;    // allocates memory for Detection only
+    else params.train = 1;              // allocates memory for Detection & Training
+
     section *s = (section *)n->val;
     list *options = s->options;
     if(!is_network(s)) error("First section must be [net] or [network]");

src/shortcut_layer.c

@@ -5,11 +5,12 @@
 #include <stdio.h>
 #include <assert.h>
 
-layer make_shortcut_layer(int batch, int index, int w, int h, int c, int w2, int h2, int c2, int assisted_excitation)
+layer make_shortcut_layer(int batch, int index, int w, int h, int c, int w2, int h2, int c2, int assisted_excitation, int train)
 {
     if(assisted_excitation) fprintf(stderr, "Shortcut Layer - AE: %d\n", index);
     else fprintf(stderr,"Shortcut Layer: %d\n", index);
     layer l = { (LAYER_TYPE)0 };
+    l.train = train;
     l.type = SHORTCUT;
     l.batch = batch;
     l.w = w2;
@@ -27,7 +28,7 @@ layer make_shortcut_layer(int batch, int index, int w, int h, int c, int w2, int
 
     l.index = index;
 
-    l.delta = (float*)calloc(l.outputs * batch, sizeof(float));
+    if (train) l.delta = (float*)calloc(l.outputs * batch, sizeof(float));
     l.output = (float*)calloc(l.outputs * batch, sizeof(float));
 
     l.forward = forward_shortcut_layer;
@@ -36,7 +37,7 @@ layer make_shortcut_layer(int batch, int index, int w, int h, int c, int w2, int
     l.forward_gpu = forward_shortcut_layer_gpu;
     l.backward_gpu = backward_shortcut_layer_gpu;
 
-    l.delta_gpu =  cuda_make_array(l.delta, l.outputs*batch);
+    if (train) l.delta_gpu =  cuda_make_array(l.delta, l.outputs*batch);
     l.output_gpu = cuda_make_array(l.output, l.outputs*batch);
     if (l.assisted_excitation)
     {
@@ -56,14 +57,17 @@ void resize_shortcut_layer(layer *l, int w, int h)
     l->h = l->out_h = h;
     l->outputs = w*h*l->out_c;
     l->inputs = l->outputs;
-    l->delta = (float*)realloc(l->delta, l->outputs * l->batch * sizeof(float));
+    if (l->train) l->delta = (float*)realloc(l->delta, l->outputs * l->batch * sizeof(float));
     l->output = (float*)realloc(l->output, l->outputs * l->batch * sizeof(float));
 
 #ifdef GPU
     cuda_free(l->output_gpu);
-    cuda_free(l->delta_gpu);
     l->output_gpu = cuda_make_array(l->output, l->outputs*l->batch);
-    l->delta_gpu = cuda_make_array(l->delta, l->outputs*l->batch);
+
+    if (l->train) {
+        cuda_free(l->delta_gpu);
+        l->delta_gpu = cuda_make_array(l->delta, l->outputs*l->batch);
+    }
 #endif
 
 }

src/shortcut_layer.h

@@ -7,7 +7,7 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
-layer make_shortcut_layer(int batch, int index, int w, int h, int c, int w2, int h2, int c2, int assisted_excitation);
+layer make_shortcut_layer(int batch, int index, int w, int h, int c, int w2, int h2, int c2, int assisted_excitation, int train);
 void forward_shortcut_layer(const layer l, network_state state);
 void backward_shortcut_layer(const layer l, network_state state);
 void resize_shortcut_layer(layer *l, int w, int h);

src/yolo_layer.c

@@ -282,7 +282,6 @@ void forward_yolo_layer(const layer l, network_state state)
                     box pred = get_yolo_box(l.output, l.biases, l.mask[n], box_index, i, j, l.w, l.h, state.net.w, state.net.h, l.w*l.h);
                     float best_iou = 0;
                     int best_t = 0;
-                    int class_id_match = 0;
                     for (t = 0; t < l.max_boxes; ++t) {
                         box truth = float_to_box_stride(state.truth + t*(4 + 1) + b*l.truths, 1);
                         int class_id = state.truth[t*(4 + 1) + b*l.truths + 4];
@@ -298,6 +297,7 @@ void forward_yolo_layer(const layer l, network_state state)
                         int obj_index = entry_index(l, b, n*l.w*l.h + j*l.w + i, 4);
                         float objectness = l.output[obj_index];
                         int pred_class_id = get_yolo_class(l.output, l.classes, class_index, l.w*l.h, objectness);
+                        int class_id_match = 0;
                         if (class_id == pred_class_id) class_id_match = 1;
                         else class_id_match = 0;