od_config_file

# SSDLite with Mobilenet v2 configuration for SANATA dataset.
# Users should configure the fine_tune_checkpoint field in the train config as
# well as the label_map_path and input_path fields in the train_input_reader and
# eval_input_reader. Search for "PATH_TO_BE_CONFIGURED" to find the fields that
# should be configured.

model {
  ssd {
    # PATH_TO_BE_CONFIGURED
    num_classes: 6
    box_coder {
      faster_rcnn_box_coder {
        y_scale: 10.0
        x_scale: 10.0
        height_scale: 5.0
        width_scale: 5.0
      }
    }
    matcher {
      argmax_matcher {
        matched_threshold: 0.5
        unmatched_threshold: 0.5
        ignore_thresholds: false
        negatives_lower_than_unmatched: true
        force_match_for_each_row: true
      }
    }
    similarity_calculator {
      iou_similarity {
      }
    }
    anchor_generator {
      ssd_anchor_generator {
        num_layers: 6
        min_scale: 0.05
        max_scale: 0.95
        aspect_ratios: 1.0
        aspect_ratios: 2.0
        aspect_ratios: 0.5
        aspect_ratios: 3.0
        aspect_ratios: 0.3333
      }
    }
    image_resizer {
      fixed_shape_resizer {
        height: 512
        width: 512
      }
    }
    box_predictor {
      convolutional_box_predictor {
        min_depth: 0
        max_depth: 0
        num_layers_before_predictor: 0
        use_dropout: false
        dropout_keep_probability: 0.8
        kernel_size: 3
        use_depthwise: true
        box_code_size: 4
        apply_sigmoid_to_scores: false
        conv_hyperparams {
          activation: RELU_6,
          regularizer {
            l2_regularizer {
              weight: 0.00004
            }
          }
          initializer {
            truncated_normal_initializer {
              stddev: 0.03
              mean: 0.0
            }
          }
          batch_norm {
            train: true,
            scale: true,
            center: true,
            decay: 0.9997,
            epsilon: 0.001,
          }
        }
      }
    }
    feature_extractor {
      type: 'ssd_mobilenet_v2'
      min_depth: 16
      depth_multiplier: .7	# CHANGED: was 1.0 originally
      use_depthwise: true
      conv_hyperparams {
        activation: RELU_6,
        regularizer {
          l2_regularizer {
            weight: 0.00004
          }
        }
        initializer {
          truncated_normal_initializer {
            stddev: 0.03
            mean: 0.0
          }
        }
        batch_norm {
          train: true,
          scale: true,
          center: true,
          decay: 0.9997,
          epsilon: 0.001,
        }
      }
    }
    loss {
      classification_loss {
        weighted_sigmoid {
        }
      }
      localization_loss {
        weighted_smooth_l1 {
        }
      }
      hard_example_miner {
        num_hard_examples: 3000
        iou_threshold: 0.99
        loss_type: CLASSIFICATION
        max_negatives_per_positive: 3
        min_negatives_per_image: 3
      }
      classification_weight: 1.0
      localization_weight: 1.0
    }
    normalize_loss_by_num_matches: true
    post_processing {
      batch_non_max_suppression {
        score_threshold: 1e-8
        iou_threshold: 0.6
        max_detections_per_class: 100
        max_total_detections: 100
      }
      score_converter: SIGMOID
    }
	encode_background_as_zeros: true
    normalize_loc_loss_by_codesize: true
    inplace_batchnorm_update: true
    freeze_batchnorm: false
  }
}

train_config: {
  batch_size: 8
  optimizer {
    rms_prop_optimizer: {
      learning_rate: {
        exponential_decay_learning_rate {
		  # In Huang et al., 2017 the params (for MobileNetv1) were:
		  # 	initial_learning_rate=0.004, decay_steps=800k, decay_factor=0.95 
		  # JKJeung used:
		  #		initial_learning_rate=0.004, decay_steps=1000, decay_factor=0.8
          initial_learning_rate: 0.004
          decay_steps: 10000
          decay_factor: 0.9
        }
      }
      momentum_optimizer_value: 0.9
      decay: 0.9
      epsilon: 1.0
    }
  }
  # PATH_TO_BE_CONFIGURED
  # Original is "published_model_checkpoints/ssdlite_mobilenet_v2_coco_2018_05_09/model.ckpt"
  fine_tune_checkpoint: ""
  fine_tune_checkpoint_type:  "detection"
  # set below to true to restore ALL variables in model checkpoint 
  load_all_detection_checkpoint_vars: true 
  summarize_gradients: false
  # Note: The below line limits the training process to 200K steps, which we
  # empirically found to be sufficient enough to train the pets dataset. This
  # effectively bypasses the learning rate schedule (the learning rate will
  # never decay). Remove the line below or set to 0 to train indefinitely.
  num_steps: 0
  data_augmentation_options {
    random_horizontal_flip {
    }
    random_image_scale {
      max_scale_ratio : 1.5
    }
  }
  data_augmentation_options {
    ssd_random_crop {
    }
  }
}

train_input_reader: {
  tf_record_input_reader {
    # PATH_TO_BE_CONFIGURED
    input_path: "data/TETMMI_train.tfrecord"
  }
  # PATH_TO_BE_CONFIGURED
  label_map_path: "labelmaps/TETMMI_label_map.pbtxt"
}

eval_config: {
  num_examples: 100
  num_visualizations: 10
  # Note that eval conducted in max(eval_interval_secs, `save_checkpoints_steps`)
  #		where `save_checkpoints_steps` is in `model_main.py` (line 65)
  eval_interval_secs: 3
  # PATH_TO_BE_CONFIGURED
  visualization_export_dir: "results/eval_results" 
  export_path: "results/eval_results"
  # Note: The below line limits the evaluation process to 10 evaluations.
  # Remove the below line to evaluate indefinitely.
  max_evals: 10
  # whether to include per-category metrics. THIS IS NOT YET IMPLEMENTED: https://stackoverflow.com/questions/51848274/show-per-category-metrics-in-tensorboard
  metrics_set: "coco_detection_metrics" 
  include_metrics_per_category: true 
}

eval_input_reader: {
  tf_record_input_reader {
    # PATH_TO_BE_CONFIGURED
    input_path: "data/TETMMI_val.tfrecord"
  }
  # PATH_TO_BE_CONFIGURED
  label_map_path: "labelmaps/TETMMI_label_map.pbtxt"
  shuffle: false
  num_readers: 1
}

# Required for quantization-aware training (needed for deployment to Coral)
graph_rewriter {
  quantization {
    delay: 18000
    weight_bits: 8
    activation_bits: 8
  }
}