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学习笔记|从0开始学习机器学习·实践|第一节 建立材料数据库01

  • 2026-05-04 10:14:42
学习笔记|从0开始学习机器学习·实践|第一节 建立材料数据库01

学习笔记从0开始学习机器学习·实践第一节 建立材料数据库01

写在前面的话

            在这个系列的学习笔记中,可以学习从建立材料数据库到解析结构数据,再进行深度学习等完整的机器学习实践。后续,也将陆续撰写其他如计算材料学(VASP,Gromacs,Gaussian等)还有机器学习理论等从0开始系列笔记。

数据库构建

基于统计概率的机器学习,模型离不开大量的数据,在材料学中,这些数据可以是材料结构或是材料的性质。结构决定性质,因此无论是从结构预测出性质,还是从性质反推出结构,都离不开大量的数据。为此,这方面,Materials Project等大量材料数据库被建立。 这里,我们将学习到如何从这些数据库中拉取我们想要获取的材料数据,本文以钙钛矿晶体结构为例,拉取MP数据库中的钙钛矿以及类钙钛矿的材料数据。

在下面的例子中,不仅能够学习到如何构建数据库,还能够学习或巩固python的用法或技巧。

在python中 # 以及'''XXX'''代表了注释,python脚本在编译运行的过程中会自动跳过这些内容,这些内容都是我在学习过程中,帮助我理解和整理思路时的笔记,希望对你也有所帮助。

materials project

导入包以及常量

from mp_api.client import MPResterimport csvfrom tqdm import tqdm#https://next-gen.materialsproject.org/api 注册获得API_KEYAPI_KEY = "APIKEY"OUTPUT_FILE = "perovskite_dataset.csv"

通过API调用MP数据库,拉取Description中含有perovskite 字段的结构。

 mpr.materials.robocrys.search(keywords=["perovskite"]

这是MPRester包中的固定写法,使用时,仅需要更换关键词即可搜索其他的材料结构。

def get_robo_perovskites(mpr):    docs = mpr.materials.robocrys.search(keywords=["perovskite"])'''   等价写法:用set可以避免重复统计   rob_ids()   for doc in docs:   rob_ids.add(doc.material_id)   '''return set(doc.material_id for doc in docs)

拉取Tags标签或remarks标记中含有perovskite 字段的结构。

#材料ID,标签,备注信息def get_tag_perovskites(mpr):'''如返回信息:MPDataDoc<ProvenanceDoc>(material_id=MPID(mp-1244953),remarks=['Amorphous'], ->表明非晶体tags=['Amorphous'],fields_not_requested=['builder_meta', 'nsites', 'elements', 'nelements', 'composition', 'composition_reduced', 'formula_pretty', 'formula_anonymous', 'chemsys', 'volume', 'density', 'density_atomic', 'symmetry', 'deprecated', 'deprecation_reasons', 'last_updated', 'origins', 'warnings', 'structure', 'property_name', 'created_at', 'references', 'authors', 'theoretical', 'database_IDs', 'history'])]'''    docs = mpr.materials.provenance.search(        fields=["material_id""tags""remarks"]    )    ids = []for doc in docs:'''        取"tags"字段,如果没有,则返回[]        等价于        if "tags" in doc:          tags=doc["tags"]         else:         tags=[]         or []防止key不存在,直接返回[]        '''        tags = doc.get("tags", []) or []        remarks = doc.get("remarks", []) or []'''        tags + remarks:拼接列表        等价为:        for x in (tags+remarks):        #str(x).lower():将xstring化,小写化          if "perovskite" in str(x).lower():            ids.append(doc.get("material_id"))           return False        '''if any("perovskite" in str(x).lower() for x in (tags + remarks)):            ids.append(doc.get("material_id"))return set(ids)

获取结构性质

def fetch_summary(mpr, material_ids):    results = []    batch_size = 1000    ids_list = list(material_ids)'''    range(0,len(ids_list),batch_size):从0开始,ids_list的长度结束,步长为batch_size    tqdm():进度条工具表    '''for i in tqdm(range(0len(ids_list), batch_size)):#batch_ids:每一次取1000个数据        batch_ids = ids_list[i:i + batch_size]        docs = mpr.materials.summary.search(            material_ids=batch_ids,            fields=["material_id","formula_pretty",#结构表达式"energy_above_hull",#凸包能"formation_energy_per_atom",#形成能"band_gap","density","volume","nsites"#晶胞内的原子数            ]        )        results.extend(docs)return results

存入csv文件

import pandas as pdrows = []def save_to_csv(data, filename):print("Saving to CSV...")    df=pd.DataFrame([    {"material_id": d.material_id,"formula": d.formula_pretty,"energy_above_hull": d.energy_above_hull,"formation_energy": d.formation_energy_per_atom,"band_gap": d.band_gap,"density": d.density,"volume": d.volume,"nsites": d.nsites    }for d in data    ])    df.to_csv(filename,index=True,encoding="utf-8")print("CSV saved!")

主函数调用所有方法

def main():with MPRester(API_KEY) as mpr:        robo_ids=get_robo_perovskite(mpr)        tags_ids=get_tag_perovskite(mpr)#取并集        all_ids=robo_ids|tags_idsprint(f"Total perovskites:{len(all_ids)}")        data=fetch_summary(mpr,all_ids)        save_to_csv(data,OUTPUT_FILENAME)
点击run,运行文件后,可以看到控制台中开始拉取数据库中的数据,运行结束后,文件夹内会存入一个名为“perovskite_dataset.csv”的文件。到此,整个拉取的过程就结束了。打开csv文件,可以看到MP数据库中所有有关钙钛矿的结构以及相应的性质数据。

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  1. CONNECT:[ UseTime:0.000469s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000694s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000297s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000254s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000481s ]
  6. SELECT * FROM `set` [ RunTime:0.000214s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000584s ]
  8. SELECT * FROM `article` WHERE `id` = 485947 LIMIT 1 [ RunTime:0.006391s ]
  9. UPDATE `article` SET `lasttime` = 1777865518 WHERE `id` = 485947 [ RunTime:0.003292s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000357s ]
  11. SELECT * FROM `article` WHERE `id` < 485947 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000491s ]
  12. SELECT * FROM `article` WHERE `id` > 485947 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000467s ]
  13. SELECT * FROM `article` WHERE `id` < 485947 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005930s ]
  14. SELECT * FROM `article` WHERE `id` < 485947 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011829s ]
  15. SELECT * FROM `article` WHERE `id` < 485947 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006706s ]
0.110825s