I got the following warning:

94: UserWarning: Converting sparse IndexedSlices to a dense Tensor with 1200012120 elements. This may consume a large amount of memory.

For the following code:

from wordbatch.extractors import WordSeq
import wordbatch
from keras.layers import Input,Embedding
wb = wordbatch.WordBatch(normalize_text, extractor=(WordSeq, {"seq_maxlen": MAX_NAME_SEQ}), procs=NUM_PROCESSOR)
wb.dictionary_freeze = True
full_df["ws_name"] = wb.fit_transform(full_df["name"])
name = Input(shape=[full_df["name"].shape[1]], name="name")
emb_name = Embedding(MAX_TEXT, 50)(name)

That is I make use of WordSeq (from WordBatch) output from the Embedding layer of a GRU network. How should I modify the code to make it work without converting to dense tensor?

  • $\begingroup$ I don't think that is an error, that is a warning explicitly put up by the guy written the code to make sure that you know what you are doing. $\endgroup$ Commented Jan 31, 2018 at 5:30
  • 1
    $\begingroup$ @KiriteeGak changed - changing from a sparse matrix to a dense tensor is something not right, hope to find a better method here $\endgroup$
    – william007
    Commented Jan 31, 2018 at 5:34
  • $\begingroup$ hello. Have you found the solution? $\endgroup$
    – Yu Gu
    Commented Oct 6, 2018 at 22:51
  • $\begingroup$ @YuGu Were you working in SUTD? $\endgroup$
    – william007
    Commented Oct 7, 2018 at 6:04

1 Answer 1


I've had the same issue with the Embedding layer in Keras. The solution is to explicitly use a TensorFlow optimizer, like here:

model.compile(loss='mse', optimizer=TFOptimizer(tf.train.GradientDescentOptimizer(0.1)))


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