!12312 Add requirements and docker file in ssd, update the config of num_ssd_boxes

From: @c_34
Reviewed-by: @oacjiewen,@liangchenghui
Signed-off-by: @liangchenghui

model_zoo/official/cv/ssd/Dockerfile

@@ -0,0 +1,6 @@
+ARG FROM_IMAGE_NAME
+FROM ${FROM_IMAGE_NAME}
+
+RUN apt install libgl1-mesa-glx -y
+COPY requirements.txt .
+RUN pip3.7 install -r requirements.txt

model_zoo/official/cv/ssd/requirements.txt

@@ -0,0 +1,4 @@
+pycocotools
+opencv-python
+xml-python
+Pillow

model_zoo/official/cv/ssd/src/config.py

@@ -27,3 +27,10 @@ config_map = {
 }
 
 config = config_map[using_model]
+
+if config.num_ssd_boxes == -1:
+    num = 0
+    h, w = config.img_shape
+    for i in range(len(config.steps)):
+        num += (h // config.steps[i]) * (w // config.steps[i]) * config.num_default[i]
+    config.num_ssd_boxes = num

model_zoo/official/cv/ssd/src/config_ssd300.py

@@ -21,7 +21,6 @@ config = ed({
     "model": "ssd300",
     "img_shape": [300, 300],
     "num_ssd_boxes": 1917,
-    "neg_pre_positive": 3,
     "match_threshold": 0.5,
     "nms_threshold": 0.6,
     "min_score": 0.1,

model_zoo/official/cv/ssd/src/config_ssd_mobilenet_v1_fpn.py

@@ -20,8 +20,7 @@ from easydict import EasyDict as ed
 config = ed({
     "model": "ssd_mobilenet_v1_fpn",
     "img_shape": [640, 640],
-    "num_ssd_boxes": 51150,
-    "neg_pre_positive": 3,
+    "num_ssd_boxes": -1,
     "match_threshold": 0.5,
     "nms_threshold": 0.6,
     "min_score": 0.1,
@@ -32,8 +31,8 @@ config = ed({
     "lr_init": 0.01333,
     "lr_end_rate": 0.0,
     "warmup_epochs": 2,
+    "weight_decay": 4e-5,
     "momentum": 0.9,
-    "weight_decay": 1.5e-4,
 
     # network
     "num_default": [6, 6, 6, 6, 6],
@@ -48,7 +47,7 @@ config = ed({
     "steps": (8, 16, 32, 64, 128),
     "prior_scaling": (0.1, 0.2),
     "gamma": 2.0,
-    "alpha": 0.75,
+    "alpha": 0.25,
     "num_addition_layers": 4,
     "use_anchor_generator": True,
     "use_global_norm": True,