Cell #25. Can't compile the student's code. Error: AttributeError("'list' object has no attribute 'channels'")

Course Q&A Deep Learning Specialization Sequence Models
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1

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Iamworking in Assignment on Trigger Words. Week3 Course 5.

While testing the function def create_training_example(background, activates, negatives, Ty): ,

After submit, this following msg appears.
Cell #25. Can’t compile the student’s code. Error: AttributeError(“‘list’ object has no attribute ‘channels’”)

Posting the complete output here

AttributeError Traceback (most recent call last)
in
19 print(“\033[92m All tests passed!”)
20
—> 21 create_training_example_test(create_training_example)

in create_training_example_test(target)
4 def create_training_example_test(target):
5 np.random.seed(18)
----> 6 x, y = target(backgrounds[0], activates, negatives, 1375)
7
8 assert type(x) == np.ndarray, “Wrong type for x”

in create_training_example(background, activates, negatives, Ty)
37 for one_random_activate in random_activates:
38 # Insert the audio clip on the background
—> 39 background, segment_time = insert_audio_clip(background,random_activates,previous_segments)
40 # Retrieve segment_start and segment_end from segment_time
41 segment_start, segment_end = segment_time

in insert_audio_clip(background, audio_clip, previous_segments)
40 ### END CODE HERE ###
41 # Step 4: Superpose audio segment and background
—> 42 new_background = background.overlay(audio_clip, position = segment_time[0])
43 else:
44 #print(“Timeouted”)

/opt/conda/lib/python3.7/site-packages/pydub/audio_segment.py in overlay(self, seg, position, loop, times, gain_during_overlay)
1151 output = StringIO()
1152
→ 1153 seg1, seg2 = AudioSegment._sync(self, seg)
1154 sample_width = seg1.sample_width
1155 spawn = seg1._spawn

/opt/conda/lib/python3.7/site-packages/pydub/audio_segment.py in _sync(cls, *segs)
434 @classmethod
435 def _sync(cls, *segs):
→ 436 channels = max(seg.channels for seg in segs)
437 frame_rate = max(seg.frame_rate for seg in segs)
438 sample_width = max(seg.sample_width for seg in segs)

/opt/conda/lib/python3.7/site-packages/pydub/audio_segment.py in (.0)
434 @classmethod
435 def _sync(cls, *segs):
→ 436 channels = max(seg.channels for seg in segs)
437 frame_rate = max(seg.frame_rate for seg in segs)
438 sample_width = max(seg.sample_width for seg in segs)

AttributeError: ‘list’ object has no attribute ‘channels’

2

I think you need to make sure you set the segment_time properly in your insert_audio_clip() function.

The segment_time variable should be a tuple. If you do print(type(segment_time)) inside of insert_audio_clip(), it should print <class 'tuple'>.

3

I am getting the same issue. Could it BE a library dependency issue? @hackyon can you please elaborate on your suggestion?

4

Unless you’re running the labs offline (ie. you have downloaded them to your desktop and run them there), it’s very unlikely to be a library dependency issue.

In the insert_audio_clip function, what are you setting segment_time as? If you do print(type(segment_time)) inside of insert_audio_clip() , it should print <class 'tuple'>. If you print(segment_time[0]), you should get a random number.

5

Another hint:
Please make sure you are passing the correct middle input (2nd input) to insert_audio_clip() in

create_training_example()

thanks!