Merge pull request scikit-learn#5071 from mth4saurabh/fix-issue-3594

[MRG] Fixes scikit-learn#3594.

Author: jnothman

sklearn/datasets/lfw.py

@@ -155,7 +155,16 @@ def _load_imgs(file_paths, slice_, color, resize):
     for i, file_path in enumerate(file_paths):
         if i % 1000 == 0:
             logger.info("Loading face #%05d / %05d", i + 1, n_faces)
-        face = np.asarray(imread(file_path)[slice_], dtype=np.float32)
+
+        # Checks if jpeg reading worked. Refer to issue #3594 for more
+        # details.
+        img = imread(file_path)
+        if img.ndim is 0:
+            raise RuntimeError("Failed to read the image file %s, "
+                               "Please make sure that libjpeg is installed"
+                               % file_path)
+
+        face = np.asarray(img[slice_], dtype=np.float32)
         face /= 255.0  # scale uint8 coded colors to the [0.0, 1.0] floats
         if resize is not None:
             face = imresize(face, resize)