{"cells":[{"metadata":{"_uuid":"8f2839f25d086af736a60e9eeb907d3b93b6e0e5","_cell_guid":"b1076dfc-b9ad-4769-8c92-a6c4dae69d19","trusted":true},"cell_type":"code","source":"import math, re, os\nimport tensorflow as tf\nimport numpy as np\nimport pandas as pd\nimport matplotlib.pyplot as plt\nfrom kaggle_datasets import KaggleDatasets\nfrom tensorflow import keras\nfrom functools import partial\nfrom PIL import Image\n\nfrom sklearn.model_selection import train_test_split\nprint(\"Tensorflow version \" + tf.__version__)\n\nimport tensorflow.keras.layers as L\nimport tensorflow.keras.backend as K","execution_count":null,"outputs":[]},{"metadata":{"trusted":true},"cell_type":"code","source":"general_path = '../input/cassava-leaf-disease-classification/'","execution_count":null,"outputs":[]},{"metadata":{"trusted":true},"cell_type":"code","source":"train = pd.read_csv(general_path + 'train.csv')\ntrain['label'] = train['label'].apply(lambda x: str(x))#train['label'].astype('string')\ntrain.sample(5)","execution_count":null,"outputs":[]},{"metadata":{"trusted":true},"cell_type":"code","source":"bad_images = 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= bad_images.split(',')","execution_count":null,"outputs":[]},{"metadata":{"trusted":true},"cell_type":"code","source":"train = train[train.image_id.isin(bad_images)]","execution_count":null,"outputs":[]},{"metadata":{"trusted":true},"cell_type":"code","source":"train['image_id'] = \"../input/cassava-leaf-disease-classification/train_images/\"+train['image_id']","execution_count":null,"outputs":[]},{"metadata":{"trusted":true},"cell_type":"code","source":"def _bytes_feature(value):\n  \"\"\"Returns a bytes_list from a string / byte.\"\"\"\n  if isinstance(value, type(tf.constant(0))):\n    value = value.numpy() # BytesList won't unpack a string from an EagerTensor.\n  return tf.train.Feature(bytes_list=tf.train.BytesList(value=[value]))\n\ndef _float_feature(value):\n  \"\"\"Returns a float_list from a float / double.\"\"\"\n  return tf.train.Feature(float_list=tf.train.FloatList(value=[value]))\n\ndef _int64_feature(value):\n  \"\"\"Returns an int64_list from a bool / enum / int / uint.\"\"\"\n  return tf.train.Feature(int64_list=tf.train.Int64List(value=[value]))\n\ndef serialize_example(feature0, feature1, feature2):\n  feature = {\n      'image': _bytes_feature(feature0),\n      'image_name': _bytes_feature(feature1),\n      'target': _int64_feature(feature2)\n  }\n  example_proto = tf.train.Example(features=tf.train.Features(feature=feature))\n  return example_proto.SerializeToString()","execution_count":null,"outputs":[]},{"metadata":{"trusted":true},"cell_type":"code","source":"from sklearn.model_selection import StratifiedKFold\nimport cv2","execution_count":null,"outputs":[]},{"metadata":{"trusted":true},"cell_type":"code","source":"train['label'] = train['label'].astype(int)","execution_count":null,"outputs":[]},{"metadata":{"trusted":true},"cell_type":"code","source":"train = train.reset_index(drop=True)","execution_count":null,"outputs":[]},{"metadata":{"trusted":true},"cell_type":"code","source":"!mkdir /kaggle/working/bad_tf_records","execution_count":null,"outputs":[]},{"metadata":{"trusted":true},"cell_type":"code","source":"new_path = '/kaggle/working/bad_tf_records/'","execution_count":null,"outputs":[]},{"metadata":{"trusted":true},"cell_type":"code","source":"database_base_path = '/kaggle/input/cassava-leaf-disease-classification/'\nPATH = f'{database_base_path}train_images/'\nIMGS = train['image_id'].tolist()\nN_FILES = 15\nHEIGHT, WIDTH = (512, 512)\nIMG_QUALITY = 100\nprint('No of Images - ', len(IMGS))\n# train = df_merged.copy()\ndisplay(train.head())\n\n\nfolds = StratifiedKFold(n_splits=N_FILES, shuffle=True, random_state=123)\ntrain['file'] = -1\n\nfor fold_n, (train_idx, val_idx) in enumerate(folds.split(train, train['label'])):\n    print('File: %s has %s samples' % (fold_n+1, len(val_idx)))\n    train['file'].loc[val_idx] = fold_n\n    \ntrain.to_csv(new_path + 'train.csv', index=False)\n\n# Writing to TFRecords\nfor tfrec_num in range(N_FILES):\n    print('\\nWriting TFRecord %i of %i...'%(tfrec_num, N_FILES))\n    samples = train[train['file'] == tfrec_num]\n    n_samples = len(samples)\n    print(f'{n_samples} samples')\n    \n    with tf.io.TFRecordWriter(new_path + 'Id_train%.2i-%i.tfrec'%(tfrec_num, n_samples)) as writer:\n        for row in samples.itertuples():\n            label = row.label\n            image_name = row.image_id\n            img_path = image_name\n            \n            img = cv2.imread(img_path)\n            img = cv2.resize(img, (HEIGHT, WIDTH))\n            img = cv2.imencode('.jpg', img, (cv2.IMWRITE_JPEG_QUALITY, IMG_QUALITY))[1].tostring()\n            \n            example = serialize_example(img, str.encode(image_name), label)\n            writer.write(example)","execution_count":null,"outputs":[]},{"metadata":{"trusted":true},"cell_type":"code","source":"","execution_count":null,"outputs":[]}],"metadata":{"kernelspec":{"language":"python","display_name":"Python 3","name":"python3"},"language_info":{"pygments_lexer":"ipython3","nbconvert_exporter":"python","version":"3.6.4","file_extension":".py","codemirror_mode":{"name":"ipython","version":3},"name":"python","mimetype":"text/x-python"}},"nbformat":4,"nbformat_minor":4}