Recibí el siguiente error mientras entrenaba los datos. He probado todas las soluciones que se ofrecen en Internet y nada parece funcionar para mí. He comprobado que las rutas y el tamaño de los archivos lmdb no son cero. Pero el problema aún existe. No tengo idea de cómo resolver este problema.

pooling_
I0411 12:42:53.114141 21769 layer_factory.hpp:77] Creating layer data
I0411 12:42:53.114586 21769 net.cpp:91] Creating Layer data
I0411 12:42:53.114604 21769 net.cpp:399] data -> data
I0411 12:42:53.114645 21769 net.cpp:399] data -> label
F0411 12:42:53.114650 21772 db_lmdb.hpp:14] Check failed: mdb_status == 0 (2 
vs. 0) No such file or directory
*** Check failure stack trace: ***
I0411 12:42:53.114673 21769 data_transformer.cpp:25] Loading mean file from: 
/home/Documents/Test/Images300/train_image_mean.binaryproto
@ 0x7fa9436a3daa (unknown)
@ 0x7fa9436a3ce4 (unknown)
@ 0x7fa9436a36e6 (unknown)
@ 0x7fa9436a6687 (unknown)
@ 0x7fa943b0472e caffe::db::LMDB::Open()
@ 0x7fa943afc644 caffe::DataReader::Body::InternalThreadEntry()
@ 0x7fa940e46a4a (unknown)
@ 0x7fa9406fe182 start_thread
@ 0x7fa942a8a47d (unknown)
@ (nil) (unknown)
Aborted (core dumped)

A continuación se muestra la configuración de mi archivo:

name: "GoogleNet"
layer {
    name: "data"
    type: "Data"
    top: "data"
    top: "label"
    include {
        phase: TRAIN
    }
    transform_param {
        mirror: true
        crop_size: 224
        mean_file: "/home/Documents/Test/Images300/train_image_mean.binaryproto"
    }
    data_param {
        source: "/home/caffe/examples/zImageDetection/ImageDetection_train_lmdb"
        batch_size: 32
        backend: LMDB
    }
}
layer {
    name: "data"
    type: "Data"
    top: "data"
    top: "label"
    include {
        phase: TEST
    }
    transform_param {
        mirror: false
        crop_size: 224
        mean_file: "/home/Documents/Test/Image300/test_image_mean.binaryproto"
    }
    data_param {
        source: "/home/caffe/examples/zImageDetection/ImageDetection_val_lmdb"
        batch_size: 50
        backend: LMDB
    }
}