Скачать или смотреть How to fix ValueError: shapes (A,) and (1,B) not aligned: A (dim 0) != 1 (di... in Python

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We're excited to share with you our newest video, "How to solve ValueError: shapes (A,) and (1,B) not aligned: A (dim 0) != 1 (dim 0) in Python". 🎥 This series is meticulously designed to arm you with knowledge 🧠 and skills 🛠️ to overcome frequent coding challenges.

Today, we will decipher 🔎 and resolve a common error faced by Python coders: the bit hard to solve ValueError: shapes (A,) and (1,B) not aligned: A (dim 0) != 1 (dim 0). Here is a snapshot of the code of the video:

Troubling Scenario: ❗️

import numpy as np

a = np.array([1, 2, 3])
b = np.array([[1, 2]])
np.dot(a, b)


Unwanted Result: 🚫
ValueError: shapes (A,) and (1,B) not aligned: A (dim 0) != 1 (dim 0)

Effective Resolution: ✔️

import numpy as np

a = np.array([1, 2, 3])
b = np.array([[1], [2], [3]])
np.dot(a, b)


Desired Output: 🏁
14

In this detailed walkthrough, we will illuminate 💡 the underlying cause of this error, and offer a comprehensive explanation: In Code1, `np.dot` expects matching inner dimensions. `a`'s shape (3,) and `b`'s shape (1, 2) are incompatible. Make `a` (1, 3) or `b` (3, 2) for alignment. Code2 executes correctly without errors. 🎯

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