Which statement best describes what early CNN layers tend to learn?

Question

BlackTom AI · Accepted Answer

Early convolutional layers act as edge detectors and simple pattern matchers: they learn oriented edges, color blobs, and basic gradients rather than whole objects.

1) Relevant knowledge points and concepts
- Convolutional filters compute dot products between learned kernels and local image patches; this makes them sensitive to local contrast, orientation, and color.
- Receptive field grows with depth: early layers see small neighborhoods and therefore capture low-level features; deeper layers combine these into complex patterns and object-level concepts.
- Empirical findings (e.g., filter visualizations from AlexNet/VGG) show first-layer filters resemble Gabor functions (edges at various orientations) and color/brightness detectors.

2) Step-by-step reasoning
- A convolutional kernel of small spatial size (e.g., 3x3 or 7x7) multiplies and sums pixel intensities in a local patch. If the kernel corresponds to an oriented edge, patches containing that edge produce large activations.
- During training, backprop updates kernels to reduce classification loss; the most useful local patterns to discriminate many classes are edges, gradients, and simple textures, so the optimization converges to those.
- Subsequent layers receive activations from these simple detectors and learn combinations (corners, motifs), and still deeper layers form object parts and full object categories.

3) Calculations / intermediate steps
- Conceptually: activation = sum(kernel_ij * patch_ij). For an edge kernel, only when patch has that orientation does the sum become large, demonstrating selectivity for edges.

4) Why the correct answer is correct
- Because early kernels operate on small patches and are tuned by learning to respond to simple, ubiquitous cues (edges/lines) that are the building blocks for higher-level recognition.

5) Why other options are incorrect
- "High-level object categories" are represented in deeper layers with large receptive fields, not early ones.
- "Only text-like features" is wrong because early filters are generic (edges, colors) not limited to text.
- "Only random noise patterns" is wrong because learned filters show structured, interpretable patterns, not noise.

6) Conclusion
The correct answer is "Simple features like edges and lines," which matches the provided answer.

Which statement best describes what early CNN layers tend to learn? 单项选择题

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